No problem.
Someone's past can be a really thorny subject. (I know this one from personal experience; I found out some things from someone's past by accident, and if they hadn't been the wonderful person they are I almost certainly would have lost a friend.) Ask her about it if you think it would help, but definitely don't put any pressure on her to tell you any more than she wants. If she wants to tell you zero, be fine with that.
And that is good. I do agree with Jess, you do sound like a wonderful person.
Good luck!