Who is Mona Mayfair from Taltos: Lives of the Mayfair Witches and what is their importance?

Mona Mayfair is the thirteen-year-old heir to the Mayfair Estate. She is a former student, devoted to her family, and the mother of Michael's child...... Morrigan. Morrigan is a Taltos. Mona will defend her daughter with her life.