This is terribly, terribly sad news.
Talia - AKA taliajoy18 on YouTube - was an upbeat, smart, self-assured young woman. I spent many an enjoyable evening watching her tutorials and often wondered at how she could be so articulate and well-informed without sounding annoyingly precocious. She was just naturally gifted when it came to applying makeup and teaching others what she had learned. I can't believe she was only 13 - much less that she is no longer with us.
Here's an example of the grace with which she handled her cancer:
And doing what she does best...
R.I.P., Talia. The world has lost some of its sparkle.