As others have pointed out... what would be the purpose of delaying her announcement if she was NOT running?
Go, Sarah, go!
Also, look at basic history. How many times has the ‘early crowd’ gone all the way? Most take each other out. SP is smartly avoiding this. When she announces, the feild will have narrowed considerably and the also rans will be gone without having been able to use her as a target.
She will only have to fight the battle once or twice, not against every person who throws a hat in the ring.
Sun Tzu, Chess, basic military tactics. But so few seem to get it.