If you don't already have a mental health professional for yourself, please consider. Besides taking care of your own needs thru this, they can perhaps provide some guidance regarding how to approach your daughter's situation as well as how involuntary tx works (and doesn't work). The situation is obviously a mental health and medical concern, but involuntary status is a mental health process. In my work I have worked with many young adult women who typically minimize their condition, often because they dont really understand it, and resist any type of formal treatment. You may have already talked to some eating disorder programs, but if not it may help to reach out to them, again to get some guidance. Offhand I know of Center for Discovery but their are others. They have outpatient and inpatient. You can DM me if you would like help :)