The District: A Futuristic Dungeon Core: The Laboratory Book 3 (Unabridged‪)‬

Emma has gained control of one district of a city run by a woman that she tried to kill. While her new position has improved her upgrade abilities the other district heads have had theirs enhanced as well.

More of what the series is known for: more super-powered action, more insults, and more upgrades in a struggle to survive.