Who is Loma Williams from Cold Sassy Tree and what is their importance?

Loma Williams is one of Grandpa Blakeslee's daughters and Will's aunt. When she was young, she wanted to be an actress, but her father quickly made himself clear that it was out of the question and completely beneath her.... that it would shame the family. Thus, Loma stays home, abandons her dream, and quickly marries a man she does not love. Loma has one child, Campbell Jr.