I agree with others that once given it is theirs to use as they want. I also agree that she is probably proud of it and does not realize the cost and time it took to make.
I can understand your disappointment but hope that you can look at it another way. I do quilting because I love to do it and it is a wonderful way to tell someone I care. I am about ready to make my oldest and dearest friend (about 50 years) a whack and stack kaleidoscope quilt. Yes I will be disappointed if she uses it for her dog or had her hubby sit on it when he is dirty, but I will still love her and it wouldn't stop me from making something else for her. I would also not say anything.