Ok, so Estella has three layers.
Outter-most: female disguise - known by the public and the empress and the maids
Inner: Male disguise - known by her male friends, co-workers, the Countess, and supposedly the crown prince
Inner-Most: WOMAN - known by her new servant dude, probably the countess bc she undressed her, most likely the prince (because he's obviously in love with her and rarely in manga is a man that ends up with a women bisexual)
Sorry, was forgetting who knew her as what and forgetting her actual original gener so i had to type it out for myself lmao