I am a believer in experience, the more you do the better you get. The first experience should be a happy thing. You should learn a lot. There are certain quilts that if you use the same seam allowance throughout, it comes out well. But I would explain how to get the perfect one and tell her to do it on the next one.
My friend, Patty, is slightly handicapped, she couldn't hold the ruler as the teacher said and was told "if you can't do it right, don't bother". Can you imagine. I teach how to adapt. If you are getting good results, I don't care how you do it unless I think you will harm your body. There are many different ways to do everything. I think I should give you options if something doesn't work for you. I was asked to teach at the shop that had "the mean teachers" including the one who was so nasty to my friend and I refused. I didn't want to be lumped in with them.