She and her cousin Cornelius Douglass inherited the tavern after her father William Douglass's death in 1752. In 1754, while she was having a row with Cornelius, Haytham Kenway and Charles Lee came to find lodging, and she promptly stopped to welcome them.
In 1782, when Ratonhnhaké:ton, Haytham's son, came to the tavern looking for Lee, Catherine asked him if he needed something, but he bluntly responded that he did not, which Catherine considered rude.
- Catherine shared her character model with Corrine.
- Catherine was the only civilian who would shove Connor or Haytham if they stood too close to her.