I'm so sorry this happened to you. You must be heartbroken
Lack of communication is the big problem. IF there was a noticeable issue (top not square, improper seam intersections, different types of fabric, etc.)before or during the quilting process, the LA should have communicated it to you.
Where do the puckers occur on the quilt top? Do you have pictures you can post?
Another quilter asked but I didn't see an answer...Did you explain that you wanted to enter it into a show? (Stopping to say it shouldn't matter...just asking if she knew and you still got those results.) Is this your first quilt using her services?
There is a SERIOUS learning curve to longarm quilting. Someone
could go out and just buy a long arm setup, put up flyers and quilt for others...but if they are not competent at it...they won't have any customers. The longarm business is run by reputation.
I would talk to her about it...in person with the quilt. Someone mentioned that the LAQ should make suggestions to you. Are you open to suggestions from her?
Did you ever hear of the phrase "ohhhh that'll quilt out"? Everyone should remember that only so much can be quilted out.
Nan