Whilr I do believe it is doable, it isn't going to be fun nor is there any surity that it will turn out the way she wanted it to.
How about this--Ask if she has pics of her doughter in each costume/leotard. Make a quilt using photo transfers to fabric. She would get probably a more pleasing quilt that not only shows the leotards/costumes,but her daughter in them as well. It would a dance memorial quilt.