Unbelievable! Any longarmer should be able to deal with different battings, and different threads. This LA seems to have poor communication skills as well. I wouldn't have paid for the first quilt and would have been tempted to tell her to pick out the stitches and do it again with the correct batting. If she does that even once she will learn that the customer is always right. You absolutely should warn your guild friends, and the LQS if she does business through them.