Will you help a friend that is addicted to drugs and homeless with cash ?

What would you do if a friend asked you for money? This friend is homeless (which you just found out about) and has been addicted to crack for 20 years. ...
This is the reason she is now homeless. For me, it is sad that things are going so bad... I haven't heard from her in five years. And she accused me of having an affair with her husband I want to help her - but I'm afraid that something will happen to her by having a drug overdose -with the money I send her. I want to know what is the right thing to do?