I hope, she has an OB/GYN that she goes to, regularly.
Because, that... is being grown up. As well.
I guess, for her, your trying to keep her out of trouble and keeping her focused on school and the house "rules" to her... means that you are just an irritating Mom who does not understand her.
Not all 17 year olds, are that way. But yet it is typical reactions, for a child that age.
She is still a Senior in high school.
Being grown up, means keeping up her grades and organizing herself and being able to manage her free time and study time too and making sure she has all the credits she needs in order to graduate.
Otherwise, she will not, graduate.
You did not mention, what kind of girl she is, overall????
Though she has sneaked out of the house before.
Is she a mature minded person?
Responsible?
Good student?
Nice friends?
Is working or pays for her own things?
Keeps up with her own hygiene?
Is kind and thoughtful?
Has she ever done anything for you, as a child? Not in a tit-for-tat way. But just because.
You are a Mom. So naturally most Moms do, do a LOT for their kids. Daily. But you feel taken advantage of. Why?
Seems like it is because she prefers.... your Ex, compared to you.
Your daughter, is in a simplistic way.... preferring your Ex because he is more lenient. That is the linear common sense of it. BUT... MAYBE... it is because maybe... he understands her. ???? Maybe your Ex has a good parental relationship with her and trusts her??? Or maybe your Ex is just doing lazy parenting and letting her do whatever she wants??? Which one, is the real situation???
I really hope, your daughter also knows full well, about STD's and diseases... and sees a Doctor regularly. Since she seems to be living... as an adult, but without the responsibilities.
The National Geographic Magazine, had a GREAT article, about the Teenage Brain and their development. I would read this.
Here is the link for the article:
http://ngm.nationalgeographic.com/2011/10/teenage-brains/...
What kind of relationship... do you have with her, BEYOND the lecturing and monitoring of her???? Do you have anything enjoyable you do together? Do you both even have conversations just for fun??? Does your daughter confide in you??? Do you accept her for who she is as an individual? Do you trust her??? Does she feel.... close to you as a Mom and that she can tell you things as a woman???
If not, then she will continue to pull away.
When I was a Teenager... I rebelled a lot too... and went out of the comfort zone of typical boundaries too. But I was not a bad kid. BUT... my Dad, trusted me. He trusted me. And I knew that. He might have seemed lenient... but all the while, he was guiding me and teaching me things.... in his own way. And he was effective. VERY effective and a "strict" parent. He was not a "buddy" parent. He was a parent and even if it "seemed" he didn't know anything... he knew EVERYTHING about me... and we were close. He never looked down on me.
But with my Mom, we were not close. She... had a different way about her. And did not accept me, for who I was and always talked to me as though I was a "dumb" thoughtless person. Never giving me any credit or the benefit of the doubt.