Love all the responses and agree...no guilt...While feeling defensive for you and others my devil mind made me think of the barter system...only not pies... Seems like all those who ask should be willing to give something of themselves too.
Maybe she and others could:
Buy all the materials needed to make the quilt
Show up at your house to work hour for hour...had visions of the toothbrush and tile grout cleaner...windows and patio door glass, cleaning, polishing furniture and cabinets, raking leaves, cleaning flower beds... the list could be endless. If she doesn't show up...you don't sew..she'd already spent her money on materials...
BTW how slow can you sew? LOL