@Alcoholic Crusader it's not that simple to the audience it's Rosaline. But for them the puzzle isn't complete, like the content of the conversion with Rosaline. Rosaline might have red hair but she could simply pin that on anyone like Marinette (maybe they don't have smth that identifies DNA in that world)...and lastly what's her motive for doing it. To me she doesn't like the crown Prince from my perspective seems like she wants seravi to always rely on her... Like let her be beneath her.