Didn’t see that one coming. (Waitaminute. Why are actors “on” shows, but “in” movies?) The name of the actress is Samantha Morton.
She’s bald in both roles, and both roles depict her in dystopias.
And her characters are repeatedly referred to by others as “the strongest” member of their group.
AND both the show and the film place her in a key plot arc in which girls are taken from their mothers. Damn.