They are Queens, all three of them, queens without husbands or parents or primogeniture, before they even realize how natural and strange this is. "She's so much happier here, have you noticed?" Edith asks Sybil, watching Mary greet petitioners one day. Sybil smiles, and if she's noticed the same thing about Edith, and about herself, well - there's no one here to defend their happiness to, and so she laughs and goes with Edith to visit the Trees.