I would take them back and store them until some time has passed. The pain never goes away, but time does dull it a bit. You may realize you do want the quilts, or may come to know to whom you wish to give the quilts. I wouldn't make that decision while the pain is so fresh.
I am lucky to still have both my parents, so although I don't know the actual loss you are suffering, my heart goes out to you and I hope you find peace in her memories.