I would base what you charge on how much you feel like you want to make it. Maybe that sounds silly, but if a few more dollars would make it easier for you to take it on then by all means ask for the extra money.
If she will purchase all of the materials, yes definitely go that way. That is a huge help (I have done it that way)
Plus if she is going to balk at the money you will find out early on when she is purchasing the materials
I have charged $10 an hour for a commisioned quilt - BUT the buyer put a cap on the total dollar. I guess I understood that. Maybe I would work slow or be lolly gagger to take advantage of the situation (but I would never do that)
Not sure $10 is enough, but it was tax free and its not my livelihood.
I don't think people realize how expensive a quilt can be. The fabric, time and quilting (if you send it out)
I still shock myself sometimes when I see how much money I spend on a quilt
