ThatZenoGuy
Residential Zealous Evolved Nano Organism
There's more reason to kill him than there is not to.
Also no they can't rebuild. Not without master. He was the only one with the know-how to generate power. That was what the whole chase was about. Also now their entire power infrastructure is exploded. And her people may have lost faith in her.
She respects him, throughout the whole movie she admires that he's as much of a survivor as she is.
They need master to make power, you can always have civilisation without power.