While I would have been upset to see this quilt in the 'sell' pile, I also have to think about how blessed your DIL is to have become part of a loving, caring family. It sounds like she didn't grow up in a loving environment, and by marrying your son, she has an opportunity to learn what it is to value family. Just my two cents worth. (As one who also did not grow up in a loving, caring family but married a wonderful man and learned how to give my own children a loving environment.)
Renee