Who is Joanna (Joey) Drayton in the film, Guess Who’s Coming to Dinner?

Joanna is a 23-year-old girl who has returned early from her trip to Hawaii. While in Hawaii, she met John Prentice and fell in love. She returns home to introduce him to her family, with hopes that they will like him as much as she does. Joanna is bubbly and a bit naïve, believing that her family will stand by their principles even when it comes to their own daughter's future.