Cutting is an addiction, so it is hard to control. Tell her about the butterfly project or tell her how much you care for her, tell her you would be lost without her. And one more thing, tell her I said stay strong <3!
Therapy might be the best option but trust me for some people it is VERY hard to stop! Make sure she knows you love her. Everyone doesn't need to know though don't be telling people. But if you think her depression could get bad enough for her to take her own life, You must make a very hard choice and tell someone. If you truly think she is in bad danger you need to tell someone.
She needs help she obviously have something wrong with her she could get sent to a mental home get her to a doctor this is serious she can lose blood like that and she could kill her self if she cut a part that could kill her
defenitly do the butterfly project..........everytime she draws one......you draw in the same palce to show her that you love and care for her........make sure she knows she can talk to you about anything thats bothering her or making her want to cut