I'd like to see a photo of what she did, front and back. Did the two of you discuss the quilting you wanted done? If the backing is a very different color than the front, you should have discussed what color bobbin thread you wanted. If the bobbin thread and the top thread are very different colors, there will always be a slight dot affect on both sides of the fabric where they are pulled through that can't be avoided but not larger than the size of the needle, usually. Gosh, I hope the two of you can work out the problem. Unless you know your quilter's work VERY well, I suggest you don't say, "Oh, do whatever you want." The two of you may have very different ideas and not be aware of that.