How did Annabella help Kira in Gathering Blue chapter 7?

According to Jamison, Annabella died in her sleep. This is very questionable and the reader infers that instead she was murdered. It is easy to say this because Annabella was an isolated person who never left her house and never talked to anyone but Kira. How would anyone know she had died but Kira (who hadn't visited on the days Annabella supposevly died)?