Only, Sasha could not hold on till the end.
Even if Sasha has a dragon, she knew, as long as Dan Frost, a.k.a Daemoncles Pendragon goes to the side of Dahlia Drakon, or even just to his previous destination of Valhalla, she would not be able to hold.
If he goes to eastern empire, not to Dahlia, the sorcerers of Quartz city will sacrifice him, and with him, the rest of the world to gain immortal lives for themselves. They submitted to the ice sorceress rather than fight her.
If he goes to Queen Dahlia, she would convince him to join her in a fire cleansing ceremony to enslave all the dragons in the world, thus ending his life. However, fire of all dragons is no match for ice sorceress, thus, she was the one who won in the end.
