At far right is Syd Chaplin. I believe the woman is Dagmar Godowsky (daughter of Leopold), who had been romantically involved with both Heifetz and Chaplin.
Around the time of this visit with Chaplin, Godowsky flew to San Diego with Heifetz on an airplane from Syd Chaplin's airfield. The pilot was Syd's business partner, Emery Rogers. It was Heifetz's first flight. See photo here.