Broken Dreamer

When her parents died, Lyra was untethered. She left school, followed her dreams, and focused on keeping herself alive. She is not a fan of people and enjoys being alone. After the asteroid hit, she spends sometime surviving and the rest looking for one of the evacuation posts. She finds it and agrees to the caveat that she will be given a job placement that suits her skills.
Across the stars, she works as a security unit pilot, steering a large, heavy bot around and keeping watch over a rehab hospital for superheroes.
As a hazing ritual, a few of the guardians sneak out to try and unmask the new security unit, so when confronted with a handsome man landing on her chest, she does what any girl would do. She shoots him in the face and then has to deal with the fallout of stunning the overseer's only son.
It isn't love at first sight, but weeks later, when she is enjoying a day off, they collide under far more romantic circumstances, and their unorthodox courtship continues.