Assuming that Slavic Mythology is the same in Anya’s world, she does mention that in that part of her Earth, the Slavic people in the west used to believe that there is a moon goddess named Devana who is the Slavic equivalent to Artemis/Diana and is also the goddess of hunt, forests, and wild life. She protects the wildlife in the region and heals animals from any injuries they may have from being hunted, her most associated animal is the bear. Many women in the old days would sacrifice a herb called Artemisia (aka verbascum) to Devana as herbs play a significant role to celebrations to Slavic deities and hang them on their houses when the day of her celebrations arrives.

Sometimes she could be worshiped alongside Morana the Slavic goddess of death as a dual faced entity similar to Hel, with one face of life and one face of death, and to Persephone who spends one half of the year on Earth and another half in the Underworld with her husband Hades.

It is even said that during the Christianization of the Slavic tribes, she may have taken the form of Our Lady of Thunder Candle who walks during cold winter nights and protects the crops from freezing with her candle and accompanied by a wolf and a basket of lark birds signaling the coming of spring.

You can find more information on her in this video and this article