Wow, this is so sad. I grew up seeing her on "Singin' in the Rain", she was incredibly talented and you can clearly see why she became such a big star.
I know she was in her 80s and she had been suffering from health problems for a while, so i'm guessing that Carrie Fisher's death was just too much for her. My heart goes out to their family right now, I know Carrie was very close to her brother, so to lose her and his mother within the span of a day has to be completely devastating. My thoughts and prayers are with the family, and I hope they get through this terrible time.