So glad that you were there to save the quilt. I have stressed to my kids the value of such things and they all get it but you know, I think that there are people who don't understand how much time and effort are put into a quilt. And in this case the obvious love that went into it for the lady in her 80's to make it.
I guess try and teach your DIL but in the meantime don't be giving them any quilts.