Snooping in someone's privacy is not right.

But I do understand...
You really should talk to her and let her know how your feeling.
Let her know that you cherish what you both have right now and you need to know if there is something that she needs to tell you before your relationship progresses.
Tell her your concerns with you and your past and hers as well

but I don't think I would tell her you snooped..

l
Good Luck to you