It’s about two identical twin sister who were brought up on a commune with hippy parents.
One has the gift of healing and works as nurse. She tries hiding her ability, but I think the doctor guesses.
One of the sisters falls in love with a black doctor, which at the time was a scandal. She is cut out of her inheritance. The twins are driving and arguing when the car crashes. One dies and the other switches places with her.
I think one of the characters is called Anna. I’ve been searching for the title for years now and have had no luck!