Okay, I was a little ticked off by this comment
You can't tell them that "Your art is so good!"
I mean, you can if you want too, but honesty needs to come first. They can't learn if you keep on saying "Oh! That's perfectly fine!" They will never learn from mistakes, or never know what they need to improve on. For example, think about this. Have you ever learned a skill? For example, swimming, soccer, singing and etc. If you did, have anyone told you "Hey! Thats wrong!" or "You need to work on that!"
Saying it's their "Art style" won't do anything better either. If that IS their art style, it's inconsistant and ugly (no offense). This is what it sounds like when you say "it's your type of art"
"Oh! Disproportionate fingers and hands is totally what a human looks like! White random pixels are totally not a problem! It's totally not distracting! Deviant art muro is the BEST art system!"
She needs criticism, and she can't hide that simple fact.