I have never been asked to make a quilt for profit - for which I am very glad. Years ago, in the 80's I did LOTS of English smocking. I decided to try and sell Bonnets and Dresses (all done with fine cotton, french seams, etc). The Bonnets were $10 in a local store - I got $5 back then and sold only a few. The dresses never moved. I finally donated them to a school auction..
I liked the idea of presenting a "list" like you would in a building contract. That might educate the client as to the extensiveness of the project.
Good luck - and if she doesn't contact you then, I hate to say this, maybe you are lucky! :D