Sounds like a typical teenager out to show that she is in charge........the good news is you are standing up and trying to make a change which shows her that you love her and will not tolerate her behavior.
Now for the hard part.......teenagers are not like little kids, with little ones you can do the time out or intimidate them some. Teenagers are less likely to fear you and time outs are just a chance to sleep lol.
The good news is there are some really great ideas you can use with her. I am all for unique punishments and reward systems with teenagers because often by the time they hit the teenage years the old tried and true punishments are no longer effective.
Teenagers are creatures of comfort......if life is not easy on them then they tend to change radically. The good news is this works in both directions. You as a parent are required to do a few basic things in life. Such as provide a safe home, food, medical attention, and schooling. You are not required to do much else.....everything else we do as parents is because we love out kids and want them to have comforts in life. The problem is if the child is acting out in such a way that is disrespectful of what you require her to do...........then maybe it is time to start stripping some of those comforts.
This will not be easy I can assure you but if you really want to get her back in line then now is the time before she gets older and more defiant.
Start off in her room......remove everything except a bed, linens and any necessities such as bath items. This means posters, radios, TVs, computers, makeup, etc. Remove it from where she can get it such as a family members home, or a storage center. (I would suggest doing this while she is at school to limit the drama). Make sure there is nothing at all fun in the room other then school books and her bed and clothes.
Next step is to remove all privileges, if she normally goes to the mall on the weekends she is forbidden to do so now.........Make up a chart that lists the days of the week and explain to her that she must have so many good days in a week in order to get one item back. That can be her freedom, or any one set item. If she has so many bad days then one item is removed.....your choice on item.
Now for the fun part...........let her know that should she regain all of her things you will begin with rewards such as the cell phone or maybe a item she has been wanting. Though these should be based on longer periods of good behavior such as a month or every six months.
I will tell you this........the first few weeks will be a living pain in the rear. She will be defiant and angry and may lash out. Do not back down..........if her behavior continues then it is time for punishments. Chores are a great outlet for teenagers. Any day her behavior is really bad she must do one hour of chores. If she already has chores that last a hour or less make sure this is on top of her regular chores.
Like I said this can take a while.........but with time she will start to miss her things and her freedom and will start a change. You must be consistent as she will try and break you......she may go as long as a few months but if you stand by this it will work.