Darth Zannah vs. The Sun Crusher

*Zannah is on Jakku meditating, when she senses Kyp in orbit.
*Kyp is being possessed by Exar Kun and pressing controls
*Can Zannah exploit his demons and break Exar Kun's control?

The Sun Crusher has already fired at Jakku, Zannah can use Darovit to heal herself

Who wins?

Neph and SWL claim that tech in SW doesn't advance. Zannah therefore deduces that the Sun Crusher can't exist.