Comment by Constantine on Myriad Eclipse

Actually there are three things

First of all his mother was direct bloodline of agamemnon family, a family who's closely tied to ancient magical relics and tools so her bloodline helped her to prevent immediate penalty. If it were any normal mage they would've died instantly due to lifeforce being sucked away for using the power of chronos, the god of time

Secondly, unlike zeke who used it in middle of battles and changed things on massive levels directly by himself, his mother never directly intervened in things and didn't change things too much. She would just peek to gather information and then she would make necessary arrangements through dawn society which she made to make the future a little advantageous bit by bit

Thirdly, she wasn't entirely immune either. Using that power was eating away at her lifeforce little by little and that's the reason she was sick and died early when zeke was still so young. Her penalty was delayed due to various factors and was slowed down alot but she wasn't entirely immune