Mrs. Cavendish, therefore, made her plans as only a woman driven desperate through jealousy could have done. 
Mrs. Cavendish's desperation meant that her plans were half-baked.
mnli hypothesis: Mrs. Cavendish's desperation meant that her plans were half-baked. premise: Mrs. Cavendish, therefore, made her plans as only a woman driven desperate through jealousy could have done. 