Should she take this medication?

Ok so my girlfriend got diagnosed with an eating disorder and they want to give her this medication called zoloft thats suppose to stop aniexty and depression. The thing is I really dont like the way these people having been going about treating her at this out patient clinic for her disorder. First off she got out of hospital and was eating really well and wouldve kept doing well if they just kept supporting her ( she has to see them every wednesday) but they threaten her that if she doesnt gain enough weight and actually tell her she has to gain 8 more pounds or whatever or theyll restrict what she can do. Now this may be effective on some patients, however my gf admits she has a problem and does really well when I support her and when they tell her that she needs to gain a set amount of weight it only sets her off and causes her to almost relapse from all the stress. Now to deal with the aniexty from the place they want to give her this drug called zoloft to remove the stress which to me is taking the easy way out for the problem they are causing instead of maybe realizing they are the problem. I dont want her to take the medication because I dont want her to have false emotions from medication and the fact that there is nothing wrong with her and that its this place causing the aniexty.I really dont like what a lot of medications do to teens these days to make them more submissive ether. I would just like some opinions on what I should do and Id greatly appreciate it.