Isabella (Spinning Jenny)

Cousin Isabella was a member of Faction Paradox who believed herself to be the last remaining remnant of the organization. Due to her belief that the Faction needed a home after the collapse of the Eleven-Day Empire she engineered circumstances to cause Spinning Jenny and Baron Samedi to break off part of Strines into a bubble reality. This plan unraveled due to the combined efforts of Elizabeth Howkins, James Braddock, and Brierly, leading to her being taken by Spinning Jenny. (PROSE: Spinning Jenny)

Behind the scenes
There are a variety of pieces of textual evidence to suggest that Isabella is a younger version of Elizabeth Howkins, from Howkins using her own hair on a doll to control Isabella, to Howkins stating that she knows who Isabella is as she does this, to Isabella previously having been initiated into Faction Paradox by killing an older version of herself and stating that she knew from experience that without said doll Howkins would be easy to kill "from experience", to another agent of the faction stating that, upon meeting Howkins for the first time, "No matter when you talk to that woman, she always thinks she knows best".