I think we are talking about 2 different movies.
A movie was made in 1967, and was called A White Rose for my Black Sister.
I am not sure if Colette's film has anything to do with it or made off of that movie, but her title is the same. I have been trying to get a copy of the original movie for years and cannot seem to locate even the name, anywhere.
Maybe the name was changed.
If anyone knows any of the actors, actress or even the producer, maybe I can still track it back. I will continue to share the information.