I would rip it out. Try lifting the top or backing from the sandwich and clipping the threads between, may be easier than trying to pick up the thread from the top or bottom. This may be one of those things you save for sitting in front of the TV. I probably would not confront the LA'r. I'm sure the others know her quality (or lack thereof) of quilting and must think it's OK. I would chalk it up to a lesson learned.