Board Thread:Episode Discussion/@comment-29684190-20191123161006/@comment-24994749-20191123222728

It's also possible Harriet is a red herring, and she will in fact be the one most hurt when an actual traitor reveals themselves.

I think Elm, who has strong "mum friend" vibes (check how Ruby was sitting on her shoulder last ep.) but was also quick to cut Ruby down with the schoolyard remark would hit the group hard if she turned traitor.