You saved those blocks and the quilt is beautiful.
From what you know, does your friend struggle to pay bills, put aside for savings?
How would you feel about having someone do something for you that you could not do yourself? Would you want to pay them, through cash/barter/gift?
As long as she is able to afford the money, I don't think you should feel guilty. How about using the money toward a project earmarked for one of the charities you support, such as Quilts of Valor.