I think she needs to not sing when her voice is hoarse. There are things you can do help the hoarseness like lemon and tea. As far as smoking cigs go I think she should trade in the cigs for smoking patches until she is fully able to quit. I think her biggest problem is that she is older and it is very natural to lose the range you once had by the time you get to 50. Actually when she did Waiting to Exhale she had already lost of vocal range than when she first came out singing.