Does she have a quiet breathy speaking voice also?
Have you heard her when she is complaining about something?
Most people use a voice that has stronger vocal closure when complaining. They get a little louder and use better support and have a more confident sound because "You KNOW what you do NOT like and want your opinion heard".
Some teachers may use the analogy of "Singing to the Back of the room". Basically you would be using the voice you use to call to someone across the street.
Also the typical New York tough guy voice(accent) will help with cord closure. "EH, Wadda ya doin' I'm tryin' to work heah..." or it will at least help teach how to stop the breathiness...