lollipop, its hard to find a way that to confront a person with an illness like this and not offend them..on one hand we want the best for them, but on the other we're scared they will jump down our throats at us.
i have suffered when an ed in the past as well, and am still fighting it.
its hard to address the problem, because so many things could be going on in someone's head. they see themselves one way, and we see them completely different.
as you yourself already know, its hard to deal with an ED, but you got past yours and that is so great. and since you have that first hand experience, maybe you could talk to her, confront her about what she is doing, but not get into a fight or anything.
just calmly ask if she wants to talk about what she is doing-and what you think she might be doing.
and explain to her that you have been through this and do not want to go through this again. let her know your here for her, and will always be an open ear, and suggest to her to possibly get some help like from her doctor, or a nutritionist or dietition.
but if she is not accepting in getting help that you might have to leave, because in the end this is about your health too. you have to do what is best for yourself. people of former ED's are vulnerable into falling back into old ways around people still intune with theres.
i hope she will accept some help, and take into consideration of your well being too. if you talk to her about how you once struggled with your ed and to get out of it too maybe she will stop not only for her, butfor you too.
good luck hun.