Sad Little Brown Mouse

It appears that Little Brown Mouse Clara has had a stroke. She is still physically strong and strong-willed. But she has an obvious injury to the left side of her body. Her eyes are bright and her fur shiny. When I first suspected there was something wrong with her she evaded me with some skill until I caught her in a corner. After cuddling her and her sister for a while I put her back in the main cage and watched as she managed to crawl all the way back up to their preferred nest. I am a little fearful that the sibling mouse may bully her but I have I also seen this mouse clean and cuddle with Clara.