Searching for Sun by Elizabeth Kaida

Genetically altered to be the perfect botanist, Asami and her diva android desperately want to make planet Gliese their new home-and escape from the overburdened and industrialized Earth. But it's been over eighty years since the first settlers began terraforming; and before she's even landed, the paradise of the Gliese colony slowly reveals shades of horror. Gliese isn't new Earth, and it isn't a dead planet. Caught between a virulent plague, a rogue colonist faction, and a deadly alien army, Asami must uncover Gliese's secrets if she wants to save the lives of her crew. In a desperate gamble, Asami must adapt her view of what being human means as she becomes something other than human herself. Through unlikely friendships, and some dangerous sentient objects, Asami unravels the truth behind a war that began before her birth, and the means to change her new world.