I think they really believe they'll have Trump in jail before the convention and they'll need someone to appoint. Haley thinks it's going to be her, and she's sending the signal that she's willing to stick it out, in spite of the trouncing she is going to get in each of the primaries.
She can stay in as long as she wants—but she will lose all fifty states—some of them by stunning mind-boggling margins.
If the Deep State wants to dictate to the Republicans she is toxic at this point.
They would find someone else.
After you get crushed by “None of the Above” you are on the political trash heap.