If no one posts it before I get home (late) tonight to check, I'm not sure what her part in the book was

Maybe she was one of Johnny's wives, or

There was a scene in the book after Johnny wins the Academy Award, and goes to a party where everyone gets drunk and they try to publicly "mate" Johnny with the Best Actress Award winner (Deanna?), or

There's another scene in the book where all these Hollywood types go to a private screening, and as soon as the lights go down, so do the actresses. She may have been one of those.