There's little reason for her to admit to the other stuff and then lie and say she wasn't involved in stealing the camera. Sure, you can sue her, but how are you going to collect a judgment and from where? Not too many 18 year olds have enough in assets that it can pay a civil judgment.

She's not liable for the credit card theft as it pertains to you. The credit card company, as I've stated before, is the victim here.