hmmmm.... I know us sewers/quilters. We would really appreciate the work of the gift, as well as the gift. Unfortunately, with all the high tech stuff out there, it has become rather impersonal. I believe this person does like the quilt and probably knows you made it. But the technology has created a time where instead of picking up the phone and calling or sending a thank you note in the mail, it has become easier for email. Don't beat yourself up. Proper Ettiquette has practically passed away. Give it time. You never know what is around the next corner.