I think you are right, Princess Margaret may have not had much personal happiness. I would further think that she was rebelling in her way at being under the thumb so to speak. Her sister forbade her to marry the man she loved or risk being excommunicated from the family. And just as surly as the Duke of Windsor became persona non grata, she saw the handwriting on the palace walls and knew that would be her fate too if she went against her sister's orders. Some could handle being cast away like that but perhaps Margaret could not. I don't know if I could. So here she was..and she married later and had two children and by all accounts she did a fine job raising them. I can't recall hearing of her kids being involved in public scandals or misbehaviour. So we need to give her credit for doing a better job of raising her kids than the Queen did...Still it is a sad day for the Windsor family.