Wait till she comes to you, Who rememberd all the details after only a course, with a smile tell her , I'm not sure if i use the same technique than your teacher, but I can look at it, if she accepts your help go for all the variations of not doing like the teacher. She should understand, Years I used to belong to a woman's group, They asked me to give quilting workshop, one night a friend replaced me, one of the students put her work away and told her that Her Teacher was doing it different, she would wait for me!