I am in no way shocked by her tragic end.
Didn't she have incurable emphysema or something on top of everything else?
If so she might not have lasted long even if the rumors about continuing hard drug use contributing to this.
We go through life making choices, some are good some are not, it's really rather simple. When you make a mistake, survive and carry on that gives you wisdom, to avoid the same thing happening. If you continue to fall into the same trap over and over...that is sad but also mostly your own doing.
Had some experience with all this myself, survived it all and can look back with pride I got over it, but also sympathy for those that simply cannot "get that monkey off their back".
RIP Amy, you had so much talent, such a shame it ended this way.