Matriarch of the Vistani. Fortune Teller that reads Taroka decks.
According to Ireena Kolyana:
Doesn't seem fond of Strahd - refers to him as "The Devil Strahd" which most Vistani don't.
According to Luvash:
Madam Ava does not approve of Strahd but wouldn't rock the boat.
In the past she has given Taroka readings to help out new comers to the lands.