Aunt Estee was a victim of Dr Grove
The way she apologized to Daisy, made it very clear that she wasn't just sorry for not being in the room, but that she KNEW it might happen. Given how A Vidala treat Hulda and tried to treat Daisy, Estee response is not aligned with how the other Aunts responded (seemingly aunt Lydia as well, but we know thats not actually true because of what Agnes says in her narration).
So I am left to believe that Aunt Estee was an earlier victim when she was a pearl girl transitioning to Aunthood. Its not established in the show. But in the book the aunts do see the dentist. So its feasible.