Dealing with violent children?

[SouthStar]

I was hoping someone could give me something....anything to suggest to a friend who is struggling.

Her teenage daughter is a handful in so many ways, I wont pretend to know the whole story. In public she is a lovely girl to be around and my kids adore her.
However my friend has just told me her daughter is now being really violent towards her and she has no idea how to handle it. Her daughter is freakishly strong and ive seen the marks she has left on my friend.

From what i understand the majority of arguements are down to them moving leaving the teens bf behind who she keeps in contact via the net which they have now cut off as she was staying up all night talking to this guy and then refusing to go to school as she was so tired. It made no difference as she has learnt how to log on using neighbours wireless or sneaks out down the local cafe who leave their wireless on all hours.

I feel so useless as ive no idea what to suggest to help but she is at breaking point.

Don't have any advice but bumping for you in hope that some-one come's along who can help!

Ok, this isn't going to be helpful, but I remember hitting my mum when I was a teenager, and I was certainly much stronger than her. There were lots of hormonal things going on, and I was depressed, which wasn't treated for years. I am now very ashamed of my teenage self, and get on well with my Mum, so it has worked out, but not until after I moved out.

I just think that when you are a teenager your bf is the centre of your world, and if she has left other things behind as well, then she is dealing with a loss in her mind at least. Clearly I don't know why they had to move, but maybe she is dealing with a lot of things, and losing her contact with her bf has made this more difficult.

I wouldn't begin to say that I know what to do about it though.