Cassandra was a close companion of Jane Auste. They often wrote letters to each other  regarding intimate things about ordinary life such as purchases and refashioning, and gifting. They also reportedly kept no secret from one another and we might have learned more about Jane and their sisterly relationship had Cassandra not burned some correspondance in 1843. At an early age Jane refused to be separated from Cassandra and is speculated that the reason Jane went to boarding school so young was to follow her sister. They were so close that Jane was concerned for her sister's grieving once she died for she was worried that she would be too restrained.