Alexei,
Pola Negri did make a film in 1932 called "A Woman Commands" for RKO Pictures in Hollywood. It was all about Alexander and Maria Draga.
It also starred Basil Rathbone and Roland Young.....
I think mistake in naming her -- She was Draga Mashin, not Draga Maria, but I suppose it sounded strange to them, so decided to change character's name to Maria.
I have also read that she had an affair with King Alexander's father who was in love with her, but when Milan abdicated she went for the son. That however seems unlikely.
Yes, King Milan was family friend to Draga's father Family, and they met once indeed. And, Draga and her first husband indeed met King Milan, then Draga had dance with King. She charmed him, and most probably he recommend to Nathalie to take her as lady in waiting.
I always wonder...I suppose Draga always knew she was really hated. Did she never thought she could had such a tragical death?
Yes she knew, she is subject of talkings in Belgrade, and she knew what might be have happen, she wanted to escape from Country several times.