Not a hapax legomenon

Her second use of "refudiate" in her tweet is an indirect way to suggest that her use of such a word on Fox was not unintentional. It's the same strategy as writing on her hand and showing it off to everyone after she was caught doing it the first time. It serves two purposes: 1) to suggest she's not a poor speaker and thinker and 2) it serves as an "in your face" to her opponents in the eyes of her supporters. I'll admit, she has a way of using her fumblings to rile up the base.