She probably thought, like so many young people that she was invincible and it couldn’t possibly happen to her. Truly sad. Your right about her celeb friends, why shocked? Is the world that she lived in, in such denial they couldn’t see? Or were they truly not real friends just faux friends who would rather not rock the boat. Faux friends will let you kill yourself and never once try to intervene, because they just don’t care enough.
Amy knew she was riding the death train from the beginning....you cannot help people who refuse it , which she did refuse many times until close brushes with death. When you play on that wire you’ll eventually fall...and she did.
A complete wasted talent by a woman who could not handle her success nor her drug and drinking habits.