I don't really know what to say in times like these, just... I'm sorry.
I think we've all had some people we know pass away in our time, but I have no idea what it must feel like when it happens to someone so young. At an old age, it's easier to accept it as it's to be expected, but for people to pass away at such a young age is just... really unfair. My best wishes go to everyone who knew her, especially her family.