I went up with a very good aerobatic pilot and I have a stomach of steel
He put this aerobatic machine through every manoeuvre you could think of.
By the time he gave me the controls to try the manoeuvres I felt as sick as a dog.
Even in a car its very rare the driver gets car sickness but common for passengers.
Maybe next time (depending on your experience ) let her fly the sortie from the right with your hands guiding things or better still pay for her to have a trial flight with an instructor with her flying from the left? My guess she will not feel ill if she is in control
Pace