If you read Born to Rule, which has Sophie in it, you come to see she may not have had that much energy as you say, but that she did get more done than Moretta. She was Queen consort of Greece, and was very strong in that role. As well., she had quite a few children, and was in general a good model of how to be a royal consort and mother. I think she accomplished much. But, Moretta was denied all this, although she could have done as well. I really can't see comparing the two sisters like that though, because although they may have had the same potential, or energy, they had the chance to do different things with it.