How to help a chinchilla in mourning?

As I posted recently, my boy Kumo passed away this week. Susu and him have been cagemates since their days at the rescue almost 10 years ago.

Susu is hard to read because she's always been a pretty passive and somewhat lazy chin (she's always been the type that would rather watch TV or watch others run rather than run a ton herself). She's also naturally more aloof, likes attention but on her time and on her terms.

However, I am a bit concerned about her being on her own for the first...

How to help a chinchilla in mourning?