Advice about anyone who's lost a Chin

Hello, my gorgeous chinchilla Roo sadly died today. Her sister Roxy seems so heartbroken. I wondered if anyone had any advice about how to comfort her? Whether they've introduced a new chin to be a companion. No chin could replace Roo at all as she was very loved my my family and her sister but I don't want her sister to go down hill. Any suggestions would be greatly appreciated.

Best wishes Rhiannon xx