Stella lay on the ground, halfway between the door and the bed Twilight was on. The other alicorn wasn't sleeping yet, but she likely would be soon. Meanwhile, she'd stay up to help guard her. Though it wouldn't be too necessary, Twilight had made some decent choices.
A couple more days of travel there, at most, and then they'd get off the ship. Guarding her afterwards would be a little harder, but still not anything she couldn't deal with. After that, they'd get those two unicorns to their Equestria and, hopefully, deal with everything else as well. And then she'd get her turn.