Bipolar / Borderline personality disorders

My adult sister (42) has started drinking heavily, abusing prescription drugs and threatening suicide, she is also a cutter. She has never left home and two years ago my mom died from cancer. Sis had been mom's primary care-giver for the previous 6 years. These bouts have progressively gotten worse and dad has recently become engaged which has sent these episodes overboard. We are currently trying the tough love principles and sis is currently being held on an involuntary basis at the hospital.

My dad and I do not have the money to send her to professional treatment centers, I doubt she would stay at this point anyway. I realize I am not her parent but I am the one all of the family goes to in crisis situations. Any suggestions, advise or direction would be greatly appreciated.