You seem to have a warped idea of famous, rich people. Just because someone is rich, doesn't mean they can do or have anything they want. Famous people are expected to behave a certain way, do certain things, and hang out with certain people. Most often, famous people (at least a lot of famous singers) have drug problems because of the people they hang out with, the stress of their job (you may work a full time job but their entire LIFE is their job. They are on the covers of magazines, on t.v. Their LIFE is on display for the whole world to see. Every FLAW, every MOVE they make is on camera. That is enough to make anyone stressed. Add to that you are expected to hang with certain people (to be with the "in" crowd) who are also just as stressed.) Drugs are a big problem with famous people. Being rich has nothing to do with it.
You are entitled to your opinion but when it comes to the DEATH of a young woman, it is best you keep that opinion to yourself if it is to be so negative, in respect for the dead and those who are saddened by her passing.
For all you know, she could have died from some condition that no one had any clue about that had nothing to do with drugs. Unlikely, but its still possible. Have some respect for the dead, even if you don't agree with her life choices. No one deserves to die young. It disturbs me you would wish death (even tell her to her face!) on your sister.