I am so sorry this happened to you. I'm beginning to quilt for the public and have heard from other longarmers that this happens to all of us, sooner or later. I've been careful, no holes yet!
It is unfortunate that she didn't see the hole and offer to fix it. Most quiltermakers seem to be the nicest people and very understanding....
I quilted and bound a beautiful top, for a dear friend, who is also a customer. I found a hole as I was binding. Scared me to death, thinking I might have made it. I mended it, and told my friend about it. She said she had seen the hole too, and knew it was not my doing! Relief!
Maybe you could tell her how you feel and perhaps, find a new longarmer, depending on how the conversation goes. It would be a shame to ruin a reputation over this mistake, Hugs, Karen