Wow that's totally unacceptable, I would return with it to your longarm quilter and show her the unbalanced tension. I would tell her that it's supposed to be a gift for a Christmas present and ask for her to remove the stitching asap AND return your payment to her. Only if this longarm quilter has done acceptable work for you previously would I allow her to requilt it. There is no excuse for this mess. Should have been obvious with the first advance of the quilt on the machine.