Jane knows her sister knows the same people, so she doesn't need to specify of whom she's speaking.

Louisa Bridges (Elizabeth Knight's sister) is also staying at Godmersham. I wonder if JA's comment about her ["She looks remarkably well (legacies are a wholesome diet), and is just what she always was."] was sarcastic? Valerie Grosvenor Meyer (in her bio of JA) thinks that JA was writing this comment "wistfully."