That's kind of my point - she's been to treatment twice for an ED...if that treatment were truly successful she would not be using meth. Perhaps addiction treatment will be a different perspective and will focus on the underlying issues prompting some of the self destructive behaviours. She said she learned coping mechanisms to deal with the ED, but I suspect they just focused on that one aspect of her life. She has multiple issues that need to be addressed and most likely a variety of tools to cope with life.
While there are some similarities between ED's and addiction, there are some glaring differences as well. What was left unaddressed in the ED treatment can be the focus during addiction treatment. Also, many addiction treatments are well versed in co-occurring ED disorders, along with other MH health diagnosis.
I think she would get much more effective treatment impatient rather than outpatient so she doesn't have other distractions. She has a lot going on, and being able to address everything in a safe environment give her the best chances at success. I realize that inpatient treatment isn't the most convenient option but I think the potential gain for a healthy life makes that inconvenience a small price to pay if it means she is happy, healthy, and functional for the rest of her life.
If she forfeits her scholarship in favor of intensive outpatient she may hve too many distractions and may not be able to focus enough to get to the root of her issues. If that's the case she may spend years in the relapse cycle, which is devestating. If she doesn't learn the coping mechanisms required life will always be a constant battle, and she may not get this opportunity again. Just my opinion.
When I tried intensive outpatient it was stressful and painful having to focus on my issues. I was not in a 24 hour controlled environment and eventually the stress of confronting my demons broke me and I relapsed, and relapsed hard. I continued intensive outpatient for an additional 4 months just getting sicker and sicker because I was using in the evenings to escape the what I was dealing with during the day. In the end it did more harm than good for me, and unless somebody has identified the underlying issues and has already made some progress with them, it can be a huge trigger for self destruction.