The Chalk Garden (movie, 1964)

A grandmother seeks a governess for her 16 year old granddaughter, Laurel, who manages to drive away each and every one so far by exposing their past, with a record of three in one week! When an applicant with a mysterious past manages to get the job, Laurel vows to expose her. Meanwhile, Laurel's married-divorced-married mother tries to get her back.