Ultimately, your friend will do what she wants to or "needs" to. If she does, that doesn't mean that its something personal against you that she couldn't hold the pact. You need to hold on to your own urges. Sometimes helping someone else can be therapeutic in itself.

If your friend has a therapist, see if you can get her to go in. Even go with her and wait in the waiting room. A good friend can be a tremendous help. More than you would imagine. Having said that, you haven't failed her as a friend if she does wind up cutting.

Try and observe her behavior from a neutral point of view. It will give you some insight as to your own behavior. If you can forgive your friend for making a mistake, remember that the next time you make one. (Lets hope the next one doesn't involve SI). What ever you do, don't enter into any pact that is negative. Lean on eachother. Chances are it will go back and forth. This is not a contest, so don't let it become one.

Sam2