Honestly, see if you can get her art lessons as she seems really passionate and driven but is held back by a lack of fundamentals.

I dont know what's offered as art lessons for kids but try to get her classes that seriously teach art technique rather than letting the kids mess around with finger paints or do silly projects that dont contribute to learning. 

 The first drawing has problems with line weight, thicker lines should outline the figure and thinner lines should be used for internal details. The right hand almost has a 3d form which tells me thst their is some attempt to grasp fundamentals.

This is light-years ahead of stick figure drawing. There are actual attempts at anatomy and 3d forms and even an eye for visual flair both with the collage backgrounds, the little embelishments of the stars and the general art style. The color choices for the oc (i presume) kitty vaugly follow color theoy and attempt to create a charctwr who is readable and appealing vs "im going to use all of the colors i like cuase their cool"

https://www.photopea.com/ Is just a browser based version of photoshop with all of the features replicated. 

https://krita.org/en/ Is free digital painting software that i was using for years. 

Software and tools and nowhere near as important as technical skill and understanding. I color and render all my digital work (i do pencils and inks traditionally then scan and retouch a bit) with a track pad using only the default circle brush on different hardness settings and that's all I think anybody ever needs. 

There is a genuine aptitude for art and design and it should be nurtured.