It's like with little kids - you just keep on them and eventually they get it. I doubt it's the verbal part; probably more the chastising tone and then the redirect.
If worse comes to worse, get a squirtgun and nail her with it when she goes for the chair. She'll get the message.
That is how I have done it. I talk to them like they are children and toss in my We don't claw.
And a laser LIGHT is like kitty crack. If you don't have one, get one. You will laugh for hours and they will be too worn out to claw a dang thing!