I would think that if a person is putting a pattern out there to make, I would then assume that the quilt was made by you, following the pattern. The pattern itself can't be sold, but, the quilt YOU MADE can. I don't see any reason why not. You might want to mention. this quilt was made from a pattern by Jane Doe.
If you buy patterns in a store for anthing, knitting crocheting, needlepoint... etc.. they are being sold so that you can use the pattern to make, and whatever you make, be for you or someone else or sell it at a craft show, that is your perogative