I feel like a lot of people forget that Brightheart and Cinderpelt were sisters. I imagine even after Brightheart recovered enough to go back to the warriors' den, she'd still sleep in the medicine cat den for a while because Cinderpelt could relate to her. They both had potentially fatal injures that impacted their lives.
I drew this right after watching a Brightheart MAP by beffalumps on YouTube, so that kinda inspired this