Hi Hopenotlost

It is a sad reality that people with disorders such as depression and BPD, sometimes struggle with active suicidal ideation leading them to attempt suicide. I am very sorry your sister is having these problems and can only imagine how tough this must be for you as well.
Where is your sister now? Is she still staying with you and your family?
We have some resources here that can be helpful when a family-member suffers from suicidal ideation:
Dealing with suicidal ideation in othersI am glad you are reaching out here for support and advice, this definitely is a difficult situation to deal with. Keep faith though, for indeed hope is not lost
The Board Parrot