I, too, think it's a bit young for your mom's friend. There are some great sites for cat fabrics, though. Good luck with it.
this one has a ton of fabrics
http://www.meowscape.com/fabricshoppe.html
this is a cool site for ideas
http://www.catswhoquilt.com/fabrics.html
several from Robert Kaufman here
http://www.quiltknit.com/fabrics/cat_fabric_1.htm
and, of course, Craft Connection had lots and lots
http://www.craftconn.com/Main.asp?Ta...&Criteria=cats
I love Laurel Burch's Fanciful Felines line and just might get some of that along with Michael Miller's Christmad Cats. Hmm, I may need to make quilts for my two feline assistants?