Girlfriend has bulimia

Its been on and off for 15 years, but now its very much on ever since she tried killing herself some months. If i go too detail into this , this story will take forever. I'm going to try and attack the main point and i'll answer any questions people will have after.

Before her suicide incident, she was sometimes anorexic or sometimes bulimic. When she was bulimic she would be so for a few months then get out of it, after which she became anorexic. I think the anorexia she had was very mild...she would eat but limited amounts. She does have a big appetite so to her, the stuff she would eat was like an anorexic. She's been self conscious about her image most of her life no thanks to her dad who raised her in the shi*test way possible. Hes long gone now.

Now, shes bulimic, which kind of means the same thing as anorexic doesn't it? She hates her days because food is mostly involved. When she thinks about food, she hates it. She hates feeling the need to eat, she hates that she could easily overeat. When she eats one bite too much, even if its one beat above what her brain has decided as acceptable, then she has the overwhelming need to puke. She says she craves food a lot, that her mouth is full of saliva cos shes really hungry. Every now and then she completely satisfies herself because the urge is too much, but then she goes to the toilet and purges it all out.

This depresses her, she cries sometimes because she knows what shes thinking and what shes doing is wrong but she cant help it. This is far from a conscious choice. She is pretty intelligent in terms of what she should be doing, but its just practically hard for her to do it. Now she says she needs to be on a low calorie diet so her brain wont ring alarms if she has stuff shes 'not suppose to have' (bulimic attitude).

Is it okay for her to be on a low calorie diet? I know its a safe option as far as not taking her on a panic attack when she eats something too much, but is it healthy?

She pukes around 2-3 times a day now. I feel like theres plenty more I need to say but it would take forever and there are no words to really express how bad she feels. As a boyfriend I'm going to be there to listen to her, to hug and and tell her how we'll get through this...but her self confidence in the whole thing is a bit shaky. She does want to get better..she is going to psychologist and a psychiatrist, and she has read a couple of books over the years about anorexia. I'm going to read around on this forum and see if i get any ideas... I did come across one person who said something about dialetical behavioral therapy. I'll google that tomorrow and see what I can find.

any ideas, comments or related stories about yourself would be helpful. Thanks