Melissa corrects me:
"Ann-Margaret was not the daughter in Guess Who's Coming to Dinner.  I
can't remember her name, Katherine something, but wasn't she Katherine
Hepburn's niece? "
You're quite right!  It was Katherine Houghton (and whatever happened to
Somehow, I managed to conflate this with BYE-BYE BIRDY!  I need a vacation.
--Don Larsson, Mankato State U., MN