Lets be honest she's awkward, unprepared, and not very clever so if she knows it's in the bag with the very few people people that have a say in who becomes our next leader then why open herself up to criticism from the rest of the population, and that's what she's worried about because if she thought she'd be praised by the plebs she'd have done the interview.
Not sure what her nickname will end up being, but I personally like Brains Truss or Thick Lizzie.