well its good that she knows theres at least 5 people that care, thats proberbly keeping her going and her bf helping must help alot, Cuttings her way of coping with the intense emotions shes feeling right now, and someone taking that method away or at least trying to stop it is gonna make her feel like shes being forced to stop when she may not nessecarly (spelling?) want to stop, but in my opinion her bf's doing the right thing in trying to stop her, he only cares for her
maybe trying to arrange her to see a doctor or counseller if shes not allready seeing someone allready, explain to her that depression is a chemical im balance in the brain, and with the right help she can get better
maybe explain to her that if she wants to get better she has to help in some way, and going to see a doctor, counseller or psychiatrist is the first step in helping herself, say its not gonna go away by its self and it needs to be sorted out very quickly before those 5 people who care for her lose a her because she wouldn't get help
hope this helps
vikki x