Sienna was sure that Kara and the two males went down this way. She had rushed out of the room after sitting on the floor, contemplating whether she should follow them or not.
After finally building up the courage to follow them, she lost sight of the three in the dark corridors. There were other Umurians walking about the ship, which force her hide several times in fear of being seen.
When she came out of her hiding spot to continue her pursuit, they were gone.
Frustrated at losing her chance to hopefully get some information on how she can get back home, Sienna walked back to her hiding spot in the corridor.
Maybe if I wait here she will come this way again. She thought. After all, she didn't know how to get back to the room or her way around the ship.