You would never continue to sew a quilt top if the tension is not right on your machine. If she knew she was having issues she should have corrected them and not continued.
I have be doing long arm quilting for almost three years (Statler by Gammill) and want my customers totally satisfied and happy with the return of there quilts.
I would go back and talk to her, I am certain she knows her work is not acceptable. To make things right she should, frog out all the quilting and stitch it properly.
With that kind of work going out of her shop she will not be in business long. There is nothing better than word of mouth from satisfied customers.
I always go by the "chain theory" for my quilting. Your chain is only as strong as its weakest link. If you have loops and long stitches in the quilting process, they will snag, catch and tear and not last very long.
Go talk to your long arm person and let them know how unhappy you are with her work. You paid good money for less than acceptable work.
Please keep us posted.