(TW: Mentions of sU1c1d3) She did not join fireclan, instead she joined the place of cold waters. In kit to leader, if you keep talking to her she will eventually say "Do you think you will you miss me when I'm gone?" The next time you visit her, she isnt there, instead, there is just flowers. If you click/tap on the flowers the text "I wonder where Night'Whisper went." (Hint: she jumped into the river to end everything, here is a website to go into her story: https://westwoods.fandom.com/wiki/Nightwhisper)