I would inquire if there was some family emergency at the quilters home. We recently had this happen with a very reliable long arm quilter (usually about a 3 week turnaround) and found out her Mother had had a stroke and she was spending most of her time there. Needless to say, we told her to do them when your able.
If its just not doing the quilts -I'd inquire and ask for mine back and find a new quilter.