I second the batik idea. Unless she likes more "traditional' fabric. I would also go with them because they will grow with her. You could maybe modify a walker type bag to the wheel chair. I might also make a special wheelchair throw with some steps or ties to help keep it on. Maybe make the two items out of the same fabric. Have your daughter measure your gd while she is in the chair to get a good idea of size to make it. I am guessing probably around 30x40ish in size. Also with the batik you can get a a jelly roll or charm pack that would have many shades of pink that would work.Hope this helps