Thanks everyone for the advices
really appreciated
Ordered some classic double sided SPD for $35 on sale online with free shipping. She did 3 spinning sessions on Wahoo and no foot pain whatsoever from the cleats since the carbon insole are really stiff.
She had terrible foot pain on my sidi T3 triathlon show using SPD-SL cleats 4 years ago before switching to Fizik shoes. Doesn’t seem to be a problem with the SPDs with those shoes.