What do an untested government agent and a social media influencer have in common? Next month, in two eagerly anticipated films, Elizabeth Olsen will play one of each. In Wind River, directed by the actor and Hell or High Water screenwriter Taylor Sheridan, Olsen stars as Jane Banner, a young FBI investigator tasked with solving a grizzly rape and murder on an isolated Native American reservation. And in the dark comedy Ingrid Goes West, she is Taylor Sloane, an L.A.-based Instagram celebrity whose seemingly perfect life inspires envy in an unhinged fan. Both movies premiered at Sundance, where Olsen first broke out six years ago in the tongue-twisting indie thriller Martha Marcy May Marlene.