Who is Lola Bourne in The Ancient Child by N. Scott Momaday?

Lola works as a piano teacher, as well as a cataloguer of rare and precious books. She and Set first meet at a gallery showing of his paintings, where she makes a purchase. Lola and Set become long time lovers. It is Lola who travels with him to the reservation where she will ultimately leave him with Grey.... a time much needed to heal.