
ALL my animals are rehomes, rescues or adoptions - all of them, dogs, cats and birds. I believe that commercializing companion animals is immoral and should be illegal.
Now, let me see if I can answer all your questions. How would you know when Pina is bonded to you? Well, I can assure you that you will know without the shadow of a doubt. GCCs are one of the most needy species of parrots - so much so that I often compare them to cockatoos. These little birds want nothing more than to perch on your shoulder and cuddle next to your neck. They CRAVE and NEED company the same that they need food and water! I always say my Codee GCC is a 'kissing fool' because the very first thing she does when I offer my finger to her is climb up my arm to my shoulder, rush to my face and putting her beak to my cheek, make a kissy noise and she does it over and over and over. She is the sweetest and most affectionate little thing - and this did NOT change when she bonded with poor Pablo (the peachfront that died). Actually, it was the perfect situation because I got to enjoy her company by having her two solid hours on me every day but, after that, I would put her in her cage with her boyfriend (they never had sex, he was old and severely handicapped, but they loved each other dearly) and she was more than happy to cuddle up to him for the rest of the day and night. And it's the same thing with all the other birds I have that are bonded to another bird, they still love me as much as they always did but they are happier and healthier for the bond with another bird (because, let's face it, no human can provide the same kind of constant attention and company to them!). So, no, it's not true that you would lose the bond with your bird if the bird bonds to another bird.
Why does it have to be a bird of the same species but of opposite gender? Well, it doesn't. But, let me qualify this. Parrots, being highly social animals, need company 24/7/365 to be happy and, when they don't have another of their own species or a human there for them all the time, they might end up bonding with a bird of a completely different species: my female GCC, the one I got the male for, was bonded to a male Peachfront conure, my male cockatoo is bonded to my female Congo gray and my male African Redbelly is bonded to my female quaker (I also had a male senegal/female Nanday pair) and I have a bonded pair of two female amazons of different species as well has had a two male tiels pair and even threesomes!). But hand-fed parrots are birds that have an identity crisis becasue they were stolen from their parents so they could imprint to humans (instead of imprinting to their parents -meaning birds of their own species and different genders) which causes them all kinds of problems in the long run, namely, lack of survival skills and proper socialization, etc. But the worst part of it is that some of them get completely confused as to what they are, birds or humans (you must have heard of birds that want to have sex with their owners) so, although this is not usually a big problem with the little ones, one should take this into consideration and offer them a companion that is of the same species and opposite gender as you will always have a better chance of getting them to bond with what nature determined was the right 'match' than to something else. The other consideration is that having one bird of each species is not good for either bird (they don't even speak the same language) and, chances are, you will end having to split yourself trying to keep both of them happy. And believe me when I tell you this is not an easy thing to do with animals that want to be with you 24/7 and are jealous of you paying attention to anybody or anybirdy else! I always strive real hard to get my birds companions of their own and, although my first consideration is their happiness, I also do it to make things easier on me!
Your spending so much time with her is great but make sure her cage has a solid side (either put it against a wall or drape a material over the back) - it helps them relax because, as prey, the 'solid wall' means no predator is going to come from this side.
Now, make sure her diet is the right one because that makes a huge difference not only in their general health but also in their mood as protein makes them hormonal and hormones mean aggression PLUS it will help you with the bonding (I'll explain below). GCCs are mainly fruit eaters so you can't free-feed (this means you fill up a bowl and leave it there all day long) protein food (pellets, seeds, nuts, avicakes, nutriberries, etc) because, if you do this, the bird will end up with high uric acid and fatty liver disease. I feed all my parrots gloop and raw produce for breakfast and all day picking and give them their protein food for dinner in a measured amount (imagine the size of the crop and give enough to fill it - for a GCC is a teeny tiny bit less than a level tablespoon, mine get budgie seed mix because my research of 25 years into their natural diets has taught me that pellets are not and never will be the best dietary option for them -I can elaborate on the reasons, if you wish). GCCs are EXCELLENT eaters and very easy to convert to a health, fresh food diet. The new guy I got was fed exclusively a mix of pellets, seeds, nuts and dried fruit (it's called Bird Paradise Ultimate Blend and it's CRAP!!!) all his life and had never had any fresh produce but he ate a slice of apple and all his gloop on his first day here and he has been trying new things every day -well, he refused to eat his raw carrot and the zucchini and the leafy greens are very spotty but, aside from these two, he has been very good. Now, why a better diet will also help with the bonding? Because a bird that is free-fed protein food will not be tempted by it when you offer it as a treat! There is nothing that shows an animal more clearly that one wants to be its friend that giving it food it likes. It's as simple as that. Now, hebivores are not the same as carnivores or even omnivores in this sense because it means more to a predator to get food than it does to a hervibore. A predator needs to hunt (which means an effort) while herbivores simply eat what they find, and although there might be a need for a certain amount of effort to find it (especially now that we are destroying natural habitats left and right!) it's more a social occasion than anything else. But parrots crave protein (because it's needed for life and reproduction and it's not easily found in abundant and constant sources in nature) so all their high value items (the type of food they like the best) are always protein food so, when you feed gloop, mash, chop or whatever for breakfast and offer the bird a single seed in your hand, the bird will force itself to take it from your hand just because it wants it badly. BUT, if the bird has protein food available all the time, it will not put any effort into getting it.