I agree with the other posters in that you don't want to squash her exuberance! I'm teaching a friend and was having the same issues. It's been a bit over a year working with her and we are much closer to a consistent seam. I would just have her examine her work for places that almost didn't catch. Try to pull the seam apart along it's entire length to make sure it won't come apart & just have her fix those areas. At this point you just don't want her masterpiece to come apart in the wash. I would steer her toward easy patterns with larger blocks. Have fun!