you could even get a 410 pump, small, easier to handle if you think she might have issues. about $150.
load it up with 4 shot, 4 shot, 4shot......then buckshot, buckshot.
I know I am going to get roasted cause the 410 aint "powerful" yadda yadda.........but if it will knock a bird down at 30 yards it will knock a man down across the room.
Good luck Mike, I hope it works out safely.