[Brandon]

Let me ask you this, James: Would you feel responsible if she actually did kill herself? If so, why?

At any rate, I wouldn't worry too much. Just by reading your description of the situation, I can say with near certainty that she won't kill herself. People who are absolutely serious about doing themselves in will make sure nothing thwarts their efforts (meaning they won't let anyone know ahead of time) and employ methods that are fail-proof (i.e. guns, jumping, hanging, etc.).

As a few people noted already, suicide attempts that involve pill-popping, superficial cuts, etc. are usually considered to be "gestures" or "cries for help." She feels crappy, and she wants people to know it and "save" her from her depression. She doesn't really want to die. This isn't to say that all suicide attempts shouldn't be taken seriously, but the mere fact that she tells you about it is enough to prove that she isn't even half-committed to it.

I wouldn't say abandon her outright, but back off a little and try to detach yourself emotionally from the situation. You can't fix her problems, only she can, and she could most definitely benefit from some professional help in doing so.