A lot of artistic license - did it make for a better movie?
It is a story begging for reinterpretation and refreshhing with a modern social overlay.
My understanding is that the Queens never met and the seen in the wash house was very theatrical (probabaly stagecraft recognising the background of the director). The sisterhood thing was an interesting take but probabaly not relevant or considered then and were there black and Asian courtiers in those times? Gay and female oppression were also explored - a historical story updated for contemporary themes? What do you think?