I am a longarmer......that being said.....mono thread is not my choice of thread-not even for wallhangings. Our sisters of the past used cotton thread for quilting and it has lasted up to today (in most cases). I love the look of thread blending with the fabric.....gives another dimension to the quilt. The trouble with mono is when one stops sewing a "line" and proceeds to make the machine or hand knot the mono thread does not knot....because of its composition you cannot tug at it like "REGULAR" thread and get a tight knot, therefore, you get unraveling in the future....I think that is what is happening to your daughter's quilt. Unless you requested mono thread, I would suggest you return to the quilter and see what can be done........if she only uses mono thread - say goodbye........and not recommend her to anyone.......JMHO