If you think of it from the birds prospective......
She has been ttaken away from her familar home and put in a strange place with strange sights, smells and sounds. Everything is new and scarey to her. So her first defence is to attack, (by biting your finger) or flee, (by moving as far away as possible). These would be all normal reactions from an aviary bird with little or no handling. Especially if your g/f dad has ben mean to her.
Firstly I would give her an area in her cage she can feel safe and hide in, like maybe a partly covered area with a sheet or something. If you have her where she can see you coming and going during the day, she will eventually get used to you and not see you as some nasty monster.
Talk to her and just take things slowly, very slowly. Let her show you when she is ready to take it to the next step.
Keep offering food and treats and move slowly if she freaks out when you are near/in the cage.
Another thing you could try is when she does start to stress, just stop what you are doing and talk gently to her to reassure her all is ok. It may take a minute or it may take 10 minutes before she relaxes again.
With trying different foods, you could try those fruit/seed treats. That way while she is picking at the seeds, she can get to taste the other food in them as well.
I guess when it all boils down to it, you can't undo months or years of aviary life in just a few short days.
Good luck with her as she really is a sweet looking bird.
![Smile :)](./images/smilies/icon_smile.gif)