welll when this fold issue has happened on my long-arm.. it was because my fabric for the backing wasn't tight enough. Sorry for your disapointment.. I understand your being mad.. Personally I would apperciate someone telling me they weren't happy so I could improve myself next time... just my thoughts here. Maybe give you discount next time.. we all are learning this craft day by day. Another thing is what is small to one person might not be small to another.. maybe next time be more specific like a meander no larger than 6' or something ... once again just my thoughts.
I am sure she will love the quilt... but I do TOTALLY understand your frustration!