This is going to be sort of a long post, but any advice would be extremely appreciated.
A little back story, I've owned a few budgies and cockatiels in the past. Have another budgie now (who did his first flight recall today. Off topic, just super excited about it). I've always wanted a big parrot. They just seemed like awesome pets. I finally found myself in a position where I felt like I'd be able to afford and commit myself to the long term relationship and responsibility that is parrot ownership. Found a pet store in my area that actually had the bird I've coveted since I was young, a greenwing macaw. She is 10 years old and has apparently been through 4 different owners already. So I saved my pennies and visited the bird at the store regularly until the day finally came where I was able to bring her home. At the store, she was calm and seemed to already be warming up to me. Needless to say, I was thrilled. I was warned the week before I finally got her that she was "wanting to have a baby."
After bringing her home, at first things went pretty well, she didn't seem too freaked out, she stepped up to me a few times, sat next to me without trying to get away, everything seemed perfect. Then, my girlfriend spent about two hours with her, talking to her and trying to gain her trust. After that, the bird very suddenly decided she wanted her as a mate. After that, everything flipped. She went from letting me pick her up and being uncomfortable with my girlfriend, to letting my girlfriend scratch her head, handle her, and play with her, then trying to bite me when I come too close. She actually got me a couple times early on (macaw's beaks are no joke), but I've learned to avoid trying anything when I see the signs leading to a bite. It was very surprising especially because the owner told me that she has never bitten anyone under any circumstance. On that note, though, the bird still lets me give her treats and will still take them from my fingers gently and careful not to accidentally bite me. So I assume it's just when her hormones are really flaring up that she feels the need to really bite me. Another thing to note is that she was clipped when I adopted her, so I think she also has confidence issues keeping her from being able to respond to unwanted human interaction well.
So I guess what I'm asking is; Is there any way I can work with the bird to begin the training process with her? Am I just going to have to wait out mating season until her hormones have calmed down? I have only had her about a week now and understand it will take time, but my goal with her is to eventually be able to get her to start trick training and also NOT be a "one person bird." Also, if we keep going down the path we're currently going down, will her one-person-ness and distrust of others persist past mating season? Because before she chose her "mate" she was pretty sociable.