She's hoping for a black swan event. Trump's arrest or even assassination. Something that will force the convention to nominate someone other than Trump.
She hopes to be the only one standing once Trump is taken out.
If for any reason, it came down to the convention picking a nominee, I highly doubt it would be Haley. If she's thinking this could be a possible path for her, she's truly delusional.
If Trump is assassination, the nation will burn.