I noticed an age restriction that would be problem in this case, so check this out
This may not be very helpful, but maybe you should just avail yourself of the free 30 day trial to check out (and/or compare) Photoshop and Photoshop Elements.
Gimp is freeware and seems to have a decent reputation.
She will be using it mainly for creating works from scratch. She probably won't be working with photos for example.
If she isn't going to edit photos, it might be good to ask whether she needs Photoshop at all. For creating works from scratch, maybe something like Corel Painter would be more appropriate since it's built for digital painting and drawing. While the full version is $299, they seem to have a Painter Lite version for $50 on Mac and Windows which might be an affordable way for a 12-year-old to start.
Thanks for this. I think perhaps you're right there may be another product that might be more suitable. I have downloaded a trail of coral painter light and also autodesk sketchbook pro. I'm going to let her try a few different program's and see which she likes the best. Are there any other similar program's that you'd recommend? Thanks for your help.