Waku says so herself in Chapter 15, there are people that she just cannot control, (while looking at Yukari by the way) also I still think it's running on a modified Steins;Gate rule, that the person dies on Day X Time: XX:XX and no second further, modified because Yukari died even earlier when she took control of her mother.
Oh and by the way, I think that she dies even earlier after she "stopped" seeing people as robots is a big hint to the solution.
last edited at Sep 27, 2014 11:32AM