Why not just shoot her? I mean god use a revoler so you don't gotta pick up the shells. O well I would be ticked off if I was a hitman a elderly lady ended up killing me during a job. Esp with her bare hands. I'd love to be the sheriff investigateing it. Be like
Ploice: Ma what happaned
Lady: Walked into my house, and this guy here was waiting to kill me.
Ploice: How did you kill him
Lady: Choked him to death with my bare hands
Ploice: (Looks at guy, and at lady) and goes "Holy Shit"