Auntie Marsh is Kate Marsh's aunt. In Episode 2, "Out of Time", she sent Kate a letter, in which she shamed Kate's actions in the viral video.
No spirit or devil could have prepared me for what you have done in that videotape.
And like a jezebel you released your harlot image before God's eye.
I will pray with my church for your soul to be saved from Eternal Hellfire.