I applaud your generosity and kindness for helping this woman. Tell her that it wasn't an easy repair and then give her basic instructions to care for her quilt.
Try not to belittle her friend's ability but say that her friend's quilt was a beautiful and thoughtful gift. Ask the co-worker to pass along to her friend, this advice: "she needs to follow the recommended amount of quilting for the batting because the batting didn't stay put after washing and it needed to be taken apart and re-quilted."