I would say keep up with the interaction. Let her ball up and just sit with her. Like i stated before make it every other day or so so not to keep it in constant stress or fear. Eventually ( i believe) they will see handling as nothing to fear. she sounds small yet so if you have a sweat shirt wear that and take her out of her tub and put her the pocket. Leave your hand in the sweatshirt pocket with her. This should give the sense of a hide and also give her some interaction with you while she is balled and hopefully that will help her relax.