I'm a control freak who is bad about minding her own business. If it were me and she expresses suicidal intentions again I would drive over to her house with a movie and junk food and stay there until I felt like it was okay to leave.

Sometimes it's easier for us to interact with each other indirectly. I learned this from my younger cousins with Asberger's syndrome. If you are just putting on a movie your friend has the option of either talking about how she feels or just knowing that you are there.