You said she is very nice - it sounds like she is truly passive/aggressive and used to getting her own way. I can tell you she is not giving this a second thought right now - it is bothering you. So as soon as you can, tell her you can no longer quilt her quilts for free. (Do you even want to quilt them for a fee? Can you trust her to pay you if she said she will?).
She will ask you when she has a quilt ready - so it is better that you tell her now so she can plan on either doing it herself or finding someone else.