my daughter is out of control

So my daughter is 16. She is beyond out of control I'm not sure what to do. So I have 4 kids, and all of them are perfectly behaved except for my oldest. My husband and I have done everything we can think of to control her. She's constantly disrespecting us, she's out till whenever she feels like it, she's having unprotected sex! Every night, like clockwork we pack up the little kids and go on the hunt for our Elise. We usually find her and drag her home. Sometimes she stays sometimes she sneaks out while we are asleep. She used to drive my husbands old car but we took that away from her and we hide the keys. She has a basic phone as we can get ahold of her, we never reward her with anything! She just doesn't care. In the last 6 months I've found 3 pregnancy tests she's taken in our bathroom, I confront her and she just laughs and says who cares. She's seen therapists and there's just not much else to do? She's doing really good in school which is the strange part. But she just hates us. We've never done anything to her, just unconditionally loved her and given her an amazing childhood. What do we do!! It's putting a strain on our family. She just doesn't give a shit