@martha now, let's apply this theory into current situation. Osiris sent this mirror to Seth in hopes that his love+memories for Nephthys will be replaced by lu** for Osiris. But Sekhmet interferes and changes the course of the plan and makes sure that Nephthys is the one who looks in the mirror instead. So, Nephthys who was completely devoted to Seth was tricked by the mirror into believing that she was in love with Osiris instead. And her love and memories of Seth was trapped in the mirror. The Nephthys we saw Horus talking to in the mirror was just the consciousness of Nephthys who held the REAL memories of her husband