I have an 11yr.old stepdaughter and she tries to find any way to make me angry.She lies,she wont listen to me,no matter what I say.She wont do her school work,it seems like everyone is afraid to discipline her,teachers,her father.She lives with me and her dad.She is the only thing we ever fight about.She thinks its funny.She started her period 3months ago.When shes with her mother she runs wild,and Im afraid that she has had sex.Her mom took her to the doctor and I dont have a clue to whats going on,all I no is that she came home with birth control pills.She is to young for this.She doesnt want to live with us anymore because there are to many rules.Im afraid that she is going to influence my 10yr.old daughter,shes sweet,does great in school,and does not bother anyone.Im so confused I dont no what to do.Can anyone help me with some answers to these problems?I no if I dont get some help now,it will be too late and she may hurt someone or herself.