Cockatiel bites and hisses despite seemingly tame?

[BonBonBirb]

Hello! I'm new to this forum and my English isn't the best so sorry in advance for that!

My 9 months old cockatiel still keeps hissing and biting my hand whenever it gets close to her and does not have food or toys inside it. While biting she will also make some kind of annoyed sound yet I can touch her head without problem while my other hand is holding a bit of millet. She is also stepping on my hand already, eating from it and even flying a short distance from the cage to my hand when I have food. I do clicker training with her pretty much every day, mostly trying to perfect the step up and flying to me for now since she barely flies by herself, she still seems scared about going out of the cage even after having her for 3 months...
She also seems to be somewhat aggressive towards certain toys like the ball with the bell inside or the colorful plastic chain, she will pursue them with a hissing open beak motion as if to shoo them away.

So I'm not entirely sure if the bird just needs more time perhaps or if I'm doing something wrong that she reacts that way? I found nothing online except the usual ignoring of the bites which I already do since weeks.

[Wolf]

How much time did you spend with her just talking to her to relax her and start the bonding process before you jumped in and started with the training? It sounds to me that you skiped that step and that she does not trust you.

[BonBonBirb]

I thought training would be a part of bonding and helping the progress?
I talked to her a lot at the start and still do. I also play music to her and whistle too. I do the usuall greetings every morning and keeping such little rituals. Otherwise I'm not sure what else I should do different.

EDIT: I forgot to mention she also cheeps at me when she wants some millet and does too when I leave the room sometimes.

[Wolf]

Ok, Training can help in this area, but usually not right from the start. It will normally take a bird close to a month to adjust to its new environment so that it is not afraid. Most of us use this time to spend a great deal of time talking and singing to them as it gets them used to us and calms them.
I am at this point assuming that this is your first parrot. You said that she is biting and making some kind of noise when she steps up onto your hand. Does she bite down hard and can you try to describe the noise that she makes? Better would be if you could make a video of this so that we can see and hear what she is doing. Parrots very often use their beak as a hand to make sure that what they are stepping onto is stable and strong enough for them, do you think that this might be what she is trying to do? Also when they are young they don't always know how much pressure to apply with their beaks and don't know that they are biting too hard and you sometimes have to teach them this.
Don't worry about her playing roughly and/or aggressively with her toys as that is normal. Sometimes they will play gently with a toy, but more often if they like the toy, it looks like they think that they must kill the toy over and over again and that the toy must be totally destroyed. This is normal for them.

[liz]

Your baby is only 9 months old. She just doesn't know much yet. Myrtle chews on me like a teething baby. When she bites too hard I tell her owe and she stops. It does take a lot of patients.

Maggie, Cagney & Lacy, Lola, Flutter and Phoenix are relatively new rescues. Each one coming with some heavy baggage. These guys bite to tell me they are scared but also twitter and call me.

It could be chewing and tasting, fear or just testing you. I think it is testing you since it will interact. They may have feathers but they also have the same emotions a child has and just has trouble telling us.

To me cockatiels are the perfection of parrots.

[BonBonBirb]

She doesnt bite when stepping up or makes and noise. Only when my hand gets too close without any food she will bite and do a sort of complaining screaming which sounds much lower than the high chirps. She doesnt bite hard usually she only has my finger between my fingers. She used to be more pissed when this happend in the past and refused to step up for a while. She doesnt really seem scared of my hand since she steps up and even flies to me. She also doesnt mind my hand being close when she is chewing on the millet I'm holding but she will duck when I try do give her head scratches at that point. When the millet isnt there I can't touch her without her complaining.

[liz]

She is just testing to see what language you understand.
Don't worry about not being able to touch her head. They don't like things coming from above. they still have the instinct that preditors come from above.
I have had Myrtle for 4 years and it has to be a cuddle situation before I can touch her head. This is the same bird that will flip over to play foot fight.

[Wolf]

I think that you don't listen to her when she doesn't want to do something and just keep insisting, when you should back off for a few minutes before you ask again and the result is that she doesn't trust you. She is young and she needs you but, I am hearing trust issues. I could be wrong, but this is what it seems to me.

[BonBonBirb]

She is just testing to see what language you understand.
Don't worry about not being able to touch her head. They don't like things coming from above. they still have the instinct that preditors come from above.
I have had Myrtle for 4 years and it has to be a cuddle situation before I can touch her head. This is the same bird that will flip over to play foot fight.

So how do I react to this behavior the best?
I actually never hold my hand above her, she is usually at shoulder level since the cage opening is in that place and it's where she usually stands when interacting with me. I tend to have my hand only coming from the sides but she has that same reaction.

EDIT: @Wolf So it would be best to just leave her be when she hisses? Sometimes it cannot be avoid tho. For example she will also hiss when I exchange food and she is near. She will even run up to my hands just to hiss at them when I fix a new toy on the cage bars.

[liz]

You don't react.
By the way if my response is not the same as Wolf's or Pajarita's, take their advice. I am only running on Mommy instinct.