You're right, she doesn't get it. There are plenty of folks who love quilts and would take them or buy them even if she wouldn't.
Why not have a quilt garage sale and recoup some money on the onew you've made...at least get enough money to buy more fabric even if you don't get paid for your time. or check out the non-profits in town - they frequently need items for fund-raisers and quilts are always a big hit in that area.
If you do what you love, those who love you will love what you do, so don't give up now. (and that wasn't meant as a slam at your daughter....but there are others out there. Chin up and keep that machine operating! Remember that you're not just feeding your addiction, you're keeping the economy moving as well.