Has she looked into a device that straps around your waist, and your wrist. Its hinged in the middle, and when you lift your arm up, locks into place, offering assitance in holding the gun up? I'm sorry, I do not know the name of the device, but can get the information if you need it, my father-in-law uses one for bowhunting. Its being offered on the market to provide a steady rest, and not neccesarily for the disabled (though it should be).