Because she's shrewd enough to know that's exactly what would set Ted off and show just how crazy he gets when anyone dares to disagree with him.
Hell, she probably watched him go off on Hannity when Hannity was just asking a simple question and it all clicked for her. She didn't have to look like mean old Megyn, she could just ask Ted a question then tell him his answer wasn't complete or that he wasn't answering the question.
Ted used to be able to restrain himself but now that the pressure is really on, there's no little game he can play, little Ted Master Debating isn't cute enough to hide his overnight flip flop on his deal with Kasich, and everyone knows Trump mopped the floor with him in the last five primaries, the real Ted Cruz comes which means people completely understand why no one except Beck can stand the guy.
“Ted Master Debating isn’t cute”
WOW, did I ever misread that sentence.