Well, Trump is past the average life expectancy for this country. His particular situation probably puts him in a shorter lived cohort than average too.
So he might die before the convention, and she would be the Republican candidate.
Since people are gloom and dooming all over the place about economy and inflation, situation favors the challenger.
So she's got a real chance at becoming the next president, if Trump dies in the next couple of months. Looking at actuary table, seems to be in the ballpark of 3-4% chance...