If you picked A: You looked over to your side, checking on Nightkit. Her sightless eyes were facing the sky. She looked a little lonely. You shrugged it off and kept playing. You looked back and saw that your sister wasn't there anymore. Probably in the nursery. She wasn't older than you, because you were born first, but didn't open your eyes first. 

If you picked B: You walked over to your sister and laid down beside her. You looked at her then rested for at least a few minutes. You looked back over to her. She wasn't there. You thought. Maybe to go play or look for her.

A) Go check the nursery then the medicine den, to the warriors den to Find Nightkit.

B) Go/Keep playing.