cathyvv

I feel your pain. It's clear that you care about her opinion and her friendship. It seems that her opinion is strong and she boldly - maybe without realizing it - disparages your work.

Have you ever told her that her opinion on this particular subject hurts you and you feel it demeans Your work? I think that her discussion with the shop owner was out of line, especially since it seems you were not there during the discussion.

Mutually acceptable terms: perhaps defining the class as teaching several techniques for fusible applique would work for the two of you?

Is it possible to have a heart to heart discussion with her where you gently tell her that her opinion is noted, but you disagree with it and please never speak of it again. Ask her to respect both your work and your reputation when working out a class schedule and content with a shop owner, especially when you will be teaching/co-teaching a class for the owner.