Why wouldn't she keep watch? She's basically a servant and will do more or less whatever is asked of her. Also she's specifically used as a hacker and communication overseer, so that would be part of her role anyways. If she's hooked up to the ship's systems she can essentially monitor every part of it at once. As far as energy goes she's a hybrid model that runs primarily on whatever the common energy source for the setting is, along with an internal synthesizer that can convert absorbed bodily fluids into fuel, allowing her to make use of all the excess cum that constantly gets pumped into her.