Hi
Please be aware that most piggies, whether from pet shops or for sale breeders are prey animals that have had hardly any contact with humans when their lives are upturned yet again and they thrust into a frightening and complex home environment with very different expectations. Even more so as she is still a baby in desperate need of company of her own kind.
Arrival in a home from the perspective of pet shop guinea pigs
Tweaking (which is different from deep instinctive defence biting) is a way some piggies express their fear and dislike of being handled.
-
" Biting" And What You Can Do (Biting, Tweaking, Nibbling and Nipping)
-
Guinea Pig Behaviours in their Context (see especially chapters 7 and 10)
The best way of making friends with her is by you using guinea big language in order to convey important concepts to her - that you are inviting her into your group, that you love and cherish her but that you as the leader will not tolerate some behaviours like tweaking - in the cavy telling-off, not in the human way. You have to reinforce it but she will tune down her behaviour to the mild version when she really has had enough.
My Brathlys (who was found abandoned in the garden of people who had moved out weeks ago and had taken the hutch with with was a biting 'present' from a rescue which had had no success with bonding or handling for the last 6 months. With my 'piggy whispering' I got her to stop biting painfully within 2 weeks and within about 3 month of living side by side with a freshly neutered boar, I had her eventually accept him although the bonding process took longer as she had to gradually work past her fear-aggression. She never quite stopped tweaking completely but it was no longer painful and just a much more gentle way of telling me that she was not happy.
Please don't wait for your little girl to figure out humans.
New Guinea Pigs: How to Best Manage Arrival and Settling In (see chapter 'a welcome in guinea pig language')
Ways of making your little girl feel safer and her new life less random:
How Do I Settle Shy New Guinea Pigs?
Training piggies to come into a box (the videos don't work but the pictures and tips are still there:
How To Pick Up And Weigh Your Guinea Pigs Safely (videos)
I hope that the links will help you understand better where your girl is coming from and how you can use cavy communication to establish a link in ways which she instantly understands.