Who is Phoebe Sommerville Calebow from Match Me If You Can and what is their importance?

Phoebe is Molly's half sister and the owner of the Stars. She and her husband, Dan, have four children and have learned to handle success and family life. Phoebe had a run in with Heath when he first started as an agent and she lost the battle. She holds grudges. She doesn't like for most of the book. Only in the end does Phoebe become part of Heath's social group.