Izzy has a general aversion to hospital rooms. That's an understatement. She has a total fear of confinement. And nothing exacerbates her fear more than being alone in a room for long periods of time. It makes her feel like she can never leave. She doesn't even like being in her own room by herself for very long. Even though she sometimes finds Abigail to be a pain, she absolutely treasures the fact that they share a room.
At the moment, the idea that she can't leave her room isn't exactly untrue. And even if it wasn't she'd still be stuck in one place. She can't get off a spaceship. But she hopes that maybe exploring the ship will relieve any tension. And the constantly shifting stars could help as well.
These next few hours are going to be pretty hard though.