The ex-headmistress of an elite all-girls school indignantly argues that education is not a country club and disdainfully describes mothers jockeying to make play dates with the offspring of Katie Couric.
The headmistress still works at the school. 
mnli hypothesis: The headmistress still works at the school.  premise: The ex-headmistress of an elite all-girls school indignantly argues that education is not a country club and disdainfully describes mothers jockeying to make play dates with the offspring of Katie Couric.