@klarsen70
My left arm was long enough and flexible, so I didn't have this problem. But maybe you could get a wire coat hanger and and pull the sides down parallel to each other to make a long handle. Bend a curve in it if straight puts it too hard to reach the waistband. Use a little duct tape around the hook if it seems like it's going to scratch her skin.
Or would some long salad tongs work? Guess it depends how tight or stretchy the waistband is.