TALK TO HER!!!! This girl is reaching out for somebody to talk to her. 12 yrs old is way to young for this. You may not feel it is your business to do, but her mother is not handling the situation. My oldest son is 12. Almost everyone tells me he is too young to talk to about sex. BS!! If he can tell me about what boys are talking about at school, he is not too young. I have responded to many, many posts by saying be blunt and honest with your kids. My mom was not with me. I made good grades, so she turned a blind eye. I did not even tell her when I started my period. I first had sex at 14, and regret it to this day. I wish my mom had talked to me. If you are worried about being the step-parent, don't. My step-dad that raised me is no longer married to my mom, but he is still my 2nd dad. I am closer to him than my real dad. He was the one who tried to "lasso me in" but my mom was not on a united front with him. I spent many turbulent teenage years rebelling. You are not replacing her mom by being there for her. You being there, whether it works or not, could change that girls life forever. Be her friend. Take her on a girly date and get her to open up. It may not be easy at first, but she is a little girl reaching out, even if it doesn't seem like it now.