Frustrated in College Frustrated, it's great that your girlfriend finally found someone caring. She deserves the highest praise for that accomplishment. She should use it as a platform to make things continuously better for her. I'm sure you'll continue to be the most wonderful, thoughtful boyfriend in the world, helping her gain the strength to totally overcome her horrible past. You'll help her see that what happened to her as a child of 10 is not something she can hold against herself.
Children often find it very difficult to seek adult help for sexual abuse.
She may simply have wanted to feel in control, powerful, after having someone else have power over her. Telling her family is best left as a goal she should work towards accomplishing via therapy to help her overcome her traumatic past. In fact, that could make her feel that someone had again taken away the power she had over her own life. Of course, if she asks you to go with her and help her tell them, you can take that as a very flattering sign that you're being supportive in the right way. By telling her that she is ever so much more than the sum of what happened in the past.