From what I understand, she went downhill right after she got religion. I'm sure Tommy can elaborate more on this.
I put no stock in "religion" nor those that sell it for by it much evil has been done in the name of God but for the sake of some sorry ass, pathetic men.
Drugs were her biggest problem. Getting religion is not the same as gaining faith and through faith, self esteem and hope.
An excess of male hormones and other related substances is hard enough on a man, but a woman? To say that her drug use played no part in her sad life is (in this case) both delusional and self justifying.