Queen Marie loved Transylvania, she had built a palace there for her own use and spent as much time as she could there.
It was she would gained Transylvania and the Banat region from Hungary after the end of the First World War. Always helps to be an engaging personality. She charmed everyone she knew, well almost. President Wilson being the notable exception, though a stroke might have been the cause of that.
Queen Maria was a dynamic person and Queen Victoria's granddaughter, through her second son. had it not been for her mother, Grand Duchess Maria of Russia, Queen Maria of Romania would have been Queen Marie of the United Kingdom.
What about her son King Carol II?