She did not care.

Why should she?

What's new to make her feel a sudden wave of emotion?

This is the world she is used to, this is the world she has been shaped to know. And to survive for her own well-being, she can't care.

And she won't care.

She won't care because she cares too much.
But obviously she doesn't care enough to not become what the dystopian world wants her to.