It's not a power that she advertises a lot because it's rather uncomfortable to do on the ship, but Rhiow can 'sidle,' meaning she steps sideways out of the visible light spectrum, in essence making herself invisible. She can still be detected by motion sensors and infrared, though.

However, there are probably still quite a few people on the ship who don't realize that the kitty talks, and nobody pays attention to animals. This would certainly work to her advantage.