What is the Disney movie about a dead girl who haunts farm where she used to live it dates from before late 70s shot in color She blonde and 1 scene becomes real dance with hero?

You're likely thinking of "The Ghost and Mr. Chicken" (1964).

Here's why it fits your description:

* Dead girl haunting a farm: The movie features a young woman named Alma who died in a tragic accident and now haunts the farm where she grew up.

* Before the late 70s: The film was released in 1964.

* Shot in color: It's a color film.

* Blonde: Alma is a blonde woman.

* Scene where she becomes real and dances with the hero: There's a scene where the main character, Luther Heggs, sees Alma in a ghostly form dancing at a party.

While not a Disney movie, "The Ghost and Mr. Chicken" is a classic comedy film with a spooky twist that fits your description perfectly. It was produced by Universal Pictures, and it's known for its lighthearted and humorous take on the ghost story genre.