I don't know her music that well, but she was young. It is sad that her depression got to that point because she was worried about people finding out. My daughter lives with depression. She has thought about suicide several times, and tried at least once. She is stable now, but it is an ongoing battle. I have suffered from small bouts of depression myself and it is not something you can just "get over".
Maybe someone famous will bring a little awareness to this condition and keep people from treating it like it has to be kept hidden.