Even a moron like Marianne could put two and two together about the eyes and how is it that the protagonists didn't? (●'◡'●)ノ
Indeed
She probably just hasn't bothered with dealing with her cousin on top of probably not having seen Nera to notice she's done something about her eyes to decieve the other family into adopting her.
Yeah shout that out loud to the Grand Duke too. At this point the FL just became shoujo-ish retarted.
Even a moron like Marianne could put two and two together about the eyes and how is it that the protagonists didn't? (●'◡'●)ノ