Unfortunately we know little surrounding this character. It could be Balto's mother. Balto was separated from her at an early age. In the second movie, she often manifests around Balto and seems to have mythical and prophetic abilities. It is suggested she is Balto's spirit guide, and appearing to him throughout the movie as different animals. Muru the mouse, the Raven, the fox, several wolverines, and three bears. These help guide him and Aleu through their journey.
Due to conflicting opinions, this character is separate from the White wolf from the first movie.