Is Gao Changgong in the warrior Lanling really as predicted?

He divined the original fate of the warrior Lan Ling, that is, his fate if the snow dance did not appear. In fact, grandma already knows everything. She knew that Snow Dance died for the king in the end, so grandma wanted to change the fate of Snow Dance. But when it thundered, grandma knew that the destiny could not be violated, so she became Gao Changgong alive and Snow Dance died.