I'm a big fan of the punishment fitting the crime. To me, nipples have nothing to do with speech. If verbal reminders fail after a time, writing lines might help her to remember the proper responses, or you could refuse to respond to her until she phrases the question or answer correctly. If she constantly interrupts while you're speaking, restrict her from speaking at all for a time, or put something in her mouth, such as a gag, the handle of her leash, etc. If her speech is disrespectful, i.e. argumentative or foul, take a hint from "A Christmas Story" and have her hold a bar of soap in her mouth.