Yes. He's been locked to a prison wall for a year or so. So Ceres figured he would want nothing more than to stand behind the wheel again. She's not telling him to work for him. She's telling him he won't need to take orders from her until the next island, and can start becoming the captain he used to be again right now. She just wants to ensure that she doesn't immediately lose the ship again as well. So she's not about to relinquish ownership of it.

I'd prefer it if you change it, because there's no way Ceres would start liking someone that reacts to her attempted gestures of kindness with anger.