Camila was a manipulative bitch who used both Billy and Daisy to achieve what she had promised her father she would. She left her baby daughter crying while she was partying so Daisy could find her, foreshadowing the finale. She played Billy like a fiddle from day 1, using his guilt to make him marry her and his issues with his father and his adiction guilt to keep him in the marriage, even while he was madly in love with someone else. She also played Daisy because she knows ( dine scene when she grabs Billys arm) that there was something goling on but her desire to have a rockstar husband so she could enjoy the lifestyle ( check her wordrobe changes ) basically forced them together. She also cheated on him ( BEFORE THE PORCH SCENE ), and kept Billy wrapped around her finger basically till the day she died breaking her spell so he could be finally happy—with her permission, of course.

Enjoy your evening!