Even though she doesn't seem too happy in the film, Margaret can fake a smile with teeth.
She can even be seen laughing..
..but most of the time it seems Margaret is not having a good time, nauseated even.
Sometimes I think she was bored hanging around the set for so long, probably even sleepy enough to nod off.
The film was too over dramatic, it caused Margaret and another actor to fall asleep. Another actor used the wide eyed sleep technique so that he would appear to be awake.