I tend to agree with this person. I am a quilter and know all the work and care that is required in making a quilt, however, I've also volunteered at several not-for-profits and they are usually swamped and badly understaffed. It often is all they can do to get the needs met let alone formally respond to donation. I do agree that they should have acknowledged the donation, however, sometimes things slip through the crack because people have so much they are trying to tend to. Extend the organization or the lady some grace and feel good that you made such a lovely and heart-felt donation.