Novel: Mildred Pierce by James M Cain, 1941. Still entertaining
Film: Mildred Pierce (1947) - starring Joan Crawford, Ann Blythe, Zachary Scott, Eve Arden - The classic holds up
Miniseries: Mildred Pierce (2011) 5 episodes - starring Kate Winslet, Evan Rachel Wood, Guy Pearce - Atmospheric, well-acted and directed, a little too slow because there is not enough material from the novel to fill 5 episodes.
Reccomended movies mentioned:
The Bad Seed (1956)
The Babadook (2014)
Whatever Happened to Baby Jane? (1962)
Duel in the Sun (1946)