The behavior you have described is a serious medical condition and you need to talk to her doctor about it. It will require a lot of care and work. Please do not let the problem continue without finding professional help.

Tough, piss her off, take her to a doctor this very week and let him explain to her what its like to be institutionalized and have a tube shoved down her nose to feed her. This is a very risky behavior, one that will lead to more serious health issues down the road, one that is caused by other serious health (mental and emotional) issues which also need to be addressed today. This is indicative of self esteem issue which being thin by binge and purge will NOT be cured. I mean sure, let her slide now, but later on when her friends turn her on to meth, coke, crank, or some other speed-type drug that takes away hunger and insures that she will stay thin then she can have issues with a drug habit too. The road she is going down is a dark one, one that gets darker the further down it she travels. It is a road that will lead to other more serious stuff that can (and will) truly mess up her life. If you love her anger her, piss her off, get her screaming and hating you when you "force" her to be seen by a doctor, when you "force" her to therapy, when you "force" her to deal with the issues and learn how to live in her own skin and/or eat reasonably and be happy with the body God blessed her with. She is not "happier". She has compromised who she is to be somebody she thinks the world wants her to be, there is only temporary delusion that one has met certain goals, never the true satisfaction and happiness that contentment with oneself can bring.

You dont want to make her mad? your not her little friend, YOU ARE HER MOTHER. What are you so afraid of...Do you want to make her..........DEAD?..c'mon. be this girls parent. I know I sound coarse, but grow up!!!

Yeah, she'll look much thinner and will dress great when she's DEAD!!! Make her mad...save her life.

Did you know she was bulimic? Did you let her do that? You are her mother and you should be more interested in her well-being than whether or not she will be upset with you. And I am sure she won't be "happy" when she discovers that her stomach is ruptured and that the acid in her stomach has caused the lining of her throat and the enamel on her teeth to wear away.

I agree with all the other answers and also wanted to add ,maybe you ahould consider seeing a dr too, like a psychiatrist. If your considering avoiding making her mad because she seems happier and DRESSES BETTER!!!! Then I think you have some things you might need to work out. As a mother ,this should be a no brainer . GOOD LUCK TO THE 2 OF YOU : )