How frustrating after all your work. Do you have any more of the fabric so that you could add additional border? I think you could do the QAYG system to make your quilt large enough. Then you could just do some straight quilting with an even feed foot.
I don't know if this would work or not...but just a suggestion.
Have you used this LA quilter before? She could have at least called you. Not very good business ethics.