Well - thank goodness he/she is gone!
Whatever her reasons, I don’t think suddenly resigning halfway through your first term as Governor is the best way to set yourself up to run for the Presidency in 3 years. (And what’s with the odd timing? The Friday before a holiday weekend? That’s traditionally “dump the bad news” time not “make good news” time.) She could have simply decided not to run for re-election next year and still had plenty of time to start a Presidential run, if that’s what she wants to do. Suddenly and unexpectedly quitting halfway through a first gubernatorial term is NOT the normal or preferred way to make yourself seem like Presidential material.