The recommendations that you're getting are.. Not incorrect, and are well intentioned, but many of them aren't fully grasping your situation. I know, because I've been in the same one while living with my GF for the past three years. My amazon doesn't distrust my GF. She actually does trust her (so far as that goes) and knows that she's not going to hurt her. However, she's jealous of my GF and extremely territorial around her. It's another level of sheer dislike that isn't a "let the bird learn with time and treats" sort of a thing. My amazon has leapt over her food bowl and bitten through my GF's thumbnail when she's feeding her, she's completely ignored treats to get a chunk of flesh, she's bitten me to show me that she doesn't appreciate sharing my attention... It's not simple socialization. It's a different level. Bonded parrots can be a monumental headache.. :/

The one biggest thing that has helped in our situation has been purchasing a play stand for her to hang out on in the living room while we watch movies, etc. It gets her away from her cage/territory and she's not on my shoulder to vent at my face. After about a year of rewarding good behavior by picking her up, moving her around, and sharing condensation off of our drinks (my GF's was an eventuality) my GF can be within 12" of us without my parrot trying to prove her metal. She's also able to give her treats about 90% of the time now. It's a super slow process, but if your GF has the patience it pays off to some extent.. Over a lot of time. My own parrot's in her mid twenties and has never really trusted anybody but me, let alone a woman, so hopefully your situation goes more smoothly than mine. I feel like there should be a support group for SOs that have to put up with their SO's jealous birds.. lol.