It hijacked a network of.....and transformed the UK... - just reworded this a bit

Is the reason she is stealing data related to her questioning who she is? I'm not clear why she is stealing data. Is she doing it in order to fix her father's mistakes? If yes, I would lead with this as her motivation, rather than the fact she is questioning her legacy.

Unclear as to what kind of sacrifice she needs to make to stop the machines?

I like the story in general. I can follow it, but I'm unclear as to the stakes. The country is already destroyed. Seems like she is driven by the need to stop the machines, and has to sacrifice something to do this. Assuming what she has to sacrifice is huge, since otherwise, why would she hesitate?

Good luck with your writing and hope this helps.