I see that you have made quilts for your mother-in-law before and she loved them. Maybe, just maybe, she or they were thinking oh not another quilt. If you can ask her if she feels she has to many quilts. Some people in my family just don't realize that you can never have to many quilts. Plus, they don't realize how many hundreds of dollars they would have to pay if they were to buy a quilt. Just a few thoughts.
Oh welcome to the Board