out of control 14yr old daughter need advice!!!

My 14yr old daughter has pushed me to my breaking point and I'm desperate for some advice! I don't know when or how it happened but for the past few months she thinks she gets to dictate my life. For example-if I get up to use the bathroom she asks where I'm going and ten seconds later she starts yelling at me that I'm taking to long. She flips out if my husband and I sleep with our door closed or halfway closed. When I leave for appointments she blows up my phone telling me I'm taking too long. She doesn't socialize all that much with her peers or friends. If her dad and i try to have a personal conversion she will sneak to see what we are talking about. And the worst part is if she doesn't get her way she will run off...even if it's dark and late and one time she got into a car with a stranger (women) but it doesn't matter she knows better! I had been looking for her for a hour before her dad called and said she was home and that a women dropped her off. I was in tears because before i knew she was home i started thinking that I wasn't going to find her. The last few times she's ran off i reported her as a runaway. All of this is so unlike her. She's punched thatme in my face and is mean to her brothers who are 5yrs old and 1yrs old. She says hateful hateful things. She has no respect for anyone in our house.

I just started taking her to a therapist in hopes that maybe it will help her. I love her with all my heart and i don't know what to do.