If it was me I would bring it back to the LA especially if I paid for the work to be done. That is just unacceptable workmanship for LA who gets paid for the service. If they gave me a hard time I would ask to see other quilts that they have quilted and compare them to your quilt. If they all look the same I would bring a book that has pictures of what is considered proper stitch control & picture of what is considered not proper stitch control. At least you have a clear case because she can not argue with the facts.
If she is a friend, then I would just start ripping out all the stitch work and either find someone else if you are willing to pay again or just quilt it yourself with a grid pattern or meander something simple.
I know my skills are limited when it comes to quilting my quilts, so I stick with grid patterns.
Good Luck, and I Feel Your Pain