This is a totally unrealistic request, unless she’s willing to pay hundreds of thousands of dollars for an assembly line retool for a run of cameras that will appeal to a very small number of people. Rather than expecting Canon to take a huge loss for charity, she needs to buy or make a custom grip.

It might be possible to 3D print a reversed camera body and transplant the internals of a Canon to the new camera. This might even be something that would be profitable, but it’s not something Canon is equipped to do themselves. It would also feel pretty cheap in the hand, totally unlike a nice camera.