Gift giving is not about the person doing the giving. It’s all about the one who is on the receiving end. A gift, especially one for your DH’s sister and her husband in celebration of their wedding anniversary, should be chosen based on what you think would bring them joy, suit their taste and lifestyle, and make them think of you with love and gratitude. If that is not a quilt, then why even consider it as a gift choice? To call her unappreciative because her taste is different than yours is not really fair. If you liked dark chocolate and she liked white chocolate, which would you give her?