I am sort of tempted to try the other well-regarded guy around here and have him check out her blade alignment as you suggested...
It's funny, their previous coach wanted to put both kids in a coro ace but our tech talked him/us into the Jackson Elle/Mirage combo.
I think it's so cool that you have TWO well regarded skate techs in the same area!
Coaches and skate techs both tend to go with what they know - and skate techs tend to go with what they have in stock, or make more profit from. AFAICT, the equipment that works best is always a very personal thing, which coaches and techs can only guess at.
I'm still be curious of the skate tech's explanation of his remarks, but, assuming equally good skate tech and coach, I would trust the coach first.
Chill! A month at 3-4 hours/week isn't much time at all to master a difficult skill like spinning! Even most really good athletes take a few months to a few years. I'm still not very good at spinning myself, but I think it requires an order of magnitude more muscular control, strength (control requires strength), and timing, than any skating skill she has worked on before.
If you try the other good tech, maybe trace the old tech's blade mounting positions on the bottoms, and keep the old insoles if he changes them, so you can bring the skates back to original configuration if desired.