People commit suicide for different reasons... sometimes they feel unwanted, or they don't know how to cope with life's problems... or it may simply be a chemical imbalance.
People commit suicide in different ways... some use knives or guns, others use drugs, and then you have those who use abusive boyfriends --- perhaps one of the slowest methods of suicide.
Other than changing tactics and treating this as a suicide attempt... there isn't much else you can do.
"The weakest soul, knowing its own weakness, and believing this truth that strength can only be developed by effort and practice, will, thus believing, at once begin to exert itself, and, adding effort to effort, patience to patience, and strength to strength, will never cease to develop, and will at last grow divinely strong."
- James Allen