My name is Alex, I'm 22 years old, from Romania (Eastern Europe)


Unfortunately, she was bought from a local pet store and not only did I "receive" her in an awful condition (her feathers were all messed up and she was incredibly scared), but the people at the store said she was actually a "he", so I patiently waited until about 2.5-3 years old to see if a ring would finally grow, but it didn't.
Due to the fact that I had to go study at a university in another town and the dorm conditions weren't fit for a parrot (8-10 hours of uninterrupted sleep, etc), I left Taco home in the care of my mom, a huge animal fan that took good care of her, in terms of socializing, cleaning and making sure she has toys to play with, but she made a big mistake in letting Taco out of her cage constantly. Basically Taco hasn't spent 1 night in her cage for about 2 years now (she's 3 y/o). She had boings and playstands installed in the room her cage was in and in the balcony aswell. My mom also moved the water and food bowls outside the cage.
When I sometimes returned home for the weekend I tried moving the food and water bowls inside the cage as to try to get her readjusted with getting in and out of the cage, but she just wouldn't eat or drink all day long, so I ended up in moving the bowls just outside the entrance, and then gradually moving them inside. As soon as they're inside Taco will stop eating period.
So this is the story so far. Now I've moved to an apartment and I feel I can take proper care of Taco, so I'm taking her with me. I have a few questions:
1. I toweled her and put her in her cage but it's too small, about 60x33x80 cm (23" x 13" x 31") L x W x H. I want to buy a big, comfy cage for her but there aren't many big cages I can find (online and local pet shops). I've somewhat made my mind on buying this one, it's rather large - 86*75.5*166.5cm (33"x29"x65"), although I would have preferred a flat-top one or a playtop one, but can't afford one of similar size. Is this a decent cage? Would it be a decent choice?
2. I'd really need some help taming-wise. Taco is semi-feral: although she likes to bring a toy and chew it on my arm and takes food from our hand, that's about as far as socializing goes. She is quite territorial, bites and is absolutely terrified of open palms / hands (I suspect she was handled a lot at the pet shop), and we couldn't fix this all these years: I tried clicker training, but couldn't go past "touch", where she would touch a wooden stick and receive a reward. Upon gradual removal of the stick and / or moving my hands closer to her (in attempt to try to make her sit on my finger), she would just back off. I went back a step and tried again for about one more month, but then I gave up.
As far as biting goes, I tried to do what everyone's saying, don't back off, it's just a bluffing stage etc., but she has this chewing motion as opposed to just biting and backing off as I see other birds doing in various clips and I don't know how to handle that.
I would greatly appreciate some tips on bonding with her, because I'm terribly confused as what to do: my dream is to be able to let her out of the cage and play with me, or sit on a playstand, when I'm around and can supervise her, and also be able to pick her up and put her back in the cage for the night or when I need to go.
What should I do at this point? Should I try bonding with her within her new cage and let her out only after ( if

I know about wing clipping but personally I feel that I'm creating a handicap and forcing a bond on her, and I don't trust vets around here aswell (there are no good avian vets that I'd trust my bird with).
Thank you so much and I'm very sorry for the long read, I just wanted to describe the situation as best as I can. Also, excuse my English. Looking forward for some tips!