You can't extract or clone Mrs C because she isn't a sim,but an object in your instillation files. Whatever you do, do not mess with her in any way. Unless you enjoy reinstalling your game. There used to be a user made sim made to look like Mrs C for download someplace, I have her and while she doesn't look identical, she looks pretty good. I gave her no nice points and she goes around kicking rubbish bins and stealing newspapers.
“I dream of a better tomorrow, where chickens can cross the road and not be questioned about their motives.” - Unknown