Harris didn't move right! She supported expanding the child tax credit, legalizing marijuana, codifying Roe, etc.
She did campaign with Cheney, but didn't endorse her or promise her a position of power or adopt any of her policy preferences. The whole point was to signal "Trump is so dangerous that even the most conservative leaders are setting aside their disagreements to support me."
I see this claim so much, and it's bullshit. Harris didn't make a single policy concession to get Cheney on board. And why would she? The entire point of having her endorse was to send the message of "Trump is so dangerous that even people who disagree with me are choosing to support me."