Buy your own explanation you have someone that's recoil sensitive and/or intimidated by the large cals.
It's good to realize/know this. At this point the best bet is to load ultra low for range practice and work on just shooting.
A part of the sensitivity is the noise, a big part of it is head game, and ya gotta work on that,, really a different topic though.
Load super light for practice, then while in the field use a typical hunting load for the gun. All of the flinch/jerk/fear is forgotten in the harvest, really.
While it's good to try to find a lighter hunting load, your dealing with something completely different.
After the gun is zero for her pratice rounds, you shoot the pratice rounds,, then the hunting load and adjust the scope accordingly,,Not to zero for you because her hold will be different, just change it for the differance in load.