When someone is undergoing an esper awakening, their hair's root color can change, or their eye color. This is often noticed especially early among East Asian espers, starting as they often do from black and black respectively.
Hata Chieko's hair follicles have been severely damaged in the process of her awakening, and will not recover for some time. Her eyes are changing from dark brown to a slightly lighter brown, and most of the time, they are closed.
When someone finishes undergoing an esper awakening, there is often some mental motion that they can undertake which will engage their power. Sometimes there is a physical element to this trigger, which can cause it to be missed until the esper stumbles over it.
Hata Chieko's power does not trigger intuitively, not when she's lying in a hospital bed and can barely move her hands.
When someone finishes undergoing an esper awakening, it is usually very obvious in the case of a psychological backlash, and sometimes even more obvious in the case of physical backlash. Sometimes, though, the results are subtle, or damage has accumulated that doesn't go away.
Hata Chieko has been undergoing a ravaging deterioration of almost every biological system in her body for almost a week.
The only thing that changes, when she finishes awakening, is that her condition stops actively worsening. Medications that would have done nothing a few days ago can ameliorate some of her symptoms. Her care can transition from palliative to curative. Her nurses can leave the room without experiencing a nagging fear that her condition will abruptly explode.
It still takes her five days to wake up.