@DIMPLES80,
You seem to misunderstand what I was saying. I know ED's are destructive, she could lose her teeth, her heart could stop from low sodium and potasium levels. Now, those are things that are dreadful for her, but its also unhealthy for this little girl. Is the child eating properly? Some women have gone around the bend with eating disorders and sometimes won't feed their children properly for fear they will get 'fat". They have a warped notion of body image, but its a mental disorder that will eventually kill her or cause serious health issues that could dog her the rest of her life.
My issue with swapping out herion v eating disorder is that drugs are illegal, are sold by criminals and pose a vastly more serious threat than Mom's binge & purge hobby.
You apparently want to tell her ex, you just want strangers to tell you its OK. Im not there, I don't know what the family dynamic is, and no one else here does either. It seems like you have the best view of what needs to be done. You can divorce your wife and get free, but the child I assume is still a minor, doesn't have the same clean escape route.
If you need a refresher on the pitfalls, the child is going to be the one suffering while your wife, you and her ex battle it out over what's best for the child. Has anybody taken the child for therapy? She has one biological mother and biological father and she probably loves both of them.
You can't make someone get help unless they are ready, if you haven't told her before, you should tell her now you will involve her ex if she doesn't get her act cleaned up. Are there any grandparents who would help? If you have already enlisted the grandparents and threatened to involve her ex-husband and she still doesn't become more responsible, maybe she shouldn't be the custodial parent.
But despite what I have written, I really don't know if you gave an honest account of the situation, and what you did write is spare in detail. This is really an issue for mental health professionals, hopefully not for CPS. This child could wind up in foster care if her father isn't equipped or willing to care for her.
This is too serious of an issue for any of the forum members to adequatly address. I do hope you manage to resolve this situation with the best possible outcome possible. We have a family member who suffered with eating disorders, practically killed her when she was in her 50's, it created havoc for her sons, and ended one marriage. She has remarried and seems to have conquered her demons. She looks great and seems happy, and I think some of it has to do with getting away from her sisters. Frankly everybody's is happy when they can avoid those 3 sisters.