Should i make the call?

A neighbor friend of mine is on again, off again the drug wagon. She has a daughter age 14 and one age 4. I have known this person, since she was two years old. She is now 39. A friend co-signed for her a new car. She has lost three cars in the past. She is divorced and her ex would love nothing better than to hear that she is back on drugs. If i make the call, she will lose her two daughters, one to the ex(daddy) and the other to the state or grandparents. I have answered many calls with situations just like this. It’s different, when it’s someone you closely know. I can make the call to her ex or the call to the state or I can do nothing at all. Question: Should i make the call? If so, to her ex or to the state or not at all?