I think we can all agree it is terribly sad. Bashing the dead does no one any good.
And it is very true - people think "If I am rich, everything will be OK. All my troubles will go away, and I'll be happy." Not true at all. You can be a billionaire and be immensely sad and depressed.
People who do drugs do it to self-medicate because they feel like something is wrong in their lives. She might have been a very depressed person.