What the name of this actress?

I only saw the last scene of the movie. The movie recently was on one of the premium channel you know (showtime.,stars,cinemax) In the last five minutes of the movie you see a blonde hair young girl in a holding room is a orange jumpsuit and she is talking to the camera and after the movie their this description about what happened to the characters because the movie was based off a true story.The movie is relatively new. I think she had blue eyes. I thought it was Tamsin Egerton but is wasn't but she looked just like her .