Big Red -
Last year I did a Sham with a friends child who is 12 as well. We did a simple 10 inch block with petals and a center which were ironed on. I let her use decorative stitches around the edge of applique.
A whole quilt might be a bit labor intensive of this pattern but would be cute mixed with plain blocks and then tied. If you are interested in the pattern name - PM me and I will get it for you.
BLock
[ATTACH=CONFIG]59860[/ATTACH]
Sham
[ATTACH=CONFIG]63011[/ATTACH]