Dandelion

Georgia and her sister, Mo, live on a mobile colony that is slowly circumnavigating the planet Ash. Ever since their father died, survival has been a constant struggle made worse by Georgia's persistent bad attitude and her refusal to play nice with those who mistreat her. When a too-good-to-be-true opportunity arises, Georgia doesn't ask any questions. Her responsibilities are few, the pay is outstanding, and the company is pleasant. 

Should she have asked questions? Is there some darker aspect to the job that she's just not seeing? The deeper Georgia digs into the details of her new occupation, the more suspicious she becomes of everything: the job, her charge, the colony in general...

In the end, her priority is to take care of her sister, but in order to do that, she'll need to make some very difficult decisions.