Sadly, because I wish recovery was the norm instead of this.
What she is saying is alcoholism 101:
Excuses Alcoholics Make
It will never, ever happen again
"Following an unusually painful or embarrassing episode caused by his addiction the remorseful, frequently tearful addict promises those he has harmed that nothing, absolutely nothing could ever cause him to repeat such behavior. He may take the lead in excoriating and flagellating himself for his unpardonable sin as a demonstration of penance and a reassurance to those he has harmed or offended. Almost always effective in allaying anxiety and soothing hurt feelings on the first occasion of use, this defense rapidly loses effectiveness with repeated use as those whom it is intended to reassure become, usually with good reason, increasingly skeptical".