I see no need to get defensive over something that isn't yours, yet you asked for. When you fish for compliments don't be mad when a shark takes your bait.
She has potential, like any human has potential. But she also seems to have a circle of friends (IE YOU) that think she shits diamonds. Being her friend doesn't mean you have to like her unconditionally or defend her like a rabid dog. Being an artist is being able to take a critique and using it.
She uses more colors and has more tools at her disposal that most 13 year olds but fancying up a cubic zirconium with a nice cut, still makes it a fake diamond. She does a lot of portraits that implies, like most young artists, that she has no idea how to draw the rest of the body. When she does draw the body she hides the hands and feet or just draws little bubbly stubs.
As far as I can see her use of color is the only thing that separates her from other people her age. But there it just looks like she takes cues from
Loish.