I am so sorry this is happening, but there is hope.
Most people who attempt suicide have depression --we know this because when we put them on antidepressant medication, they no longer want to try to kill themselves.
She needs to see a Psychiatrist and get on antidepressant medication.
Depression is a brain issue -- it's not about weakness, or being crazy -- it's a neurochemical problem. When you take antidepressant medication-- it regulates the brain's neurochemicals. This is no different than needing insulin for diabetes.
Other people who attempt suicide can have Bipolar Disorder -- that is marked by very low depressions and either very high manic episodes -- either irritability or grand times of no sleep, lots of spending, loving life (highs).
The psychiatrist will take a full history of her moods, medical issues, sleep, eating and other symptoms and make a diagnosis and prescribe medication.
Email back if you have further questions or you want to run the medication by me.