I still keep thinking that the other person is Galadriel. Because I think I still can't come up with anything better, I will reveal my reasoning, maybe somebody else will conclude something based on it - the "labour with feet" seems to me like allusion to travel, thus, the Flight of Noldor, obviously, and probably the "no peace between kin" means Fëanor and either the whole second line, or Finarfin's house, anyway. Galadriel had a daughter, of course.
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"Should the story say 'he ate bread,' the dramatic producer can only show 'a piece of bread' according to his taste or fancy, but the hearer of the story will think of bread in general and picture it in some form of his own." -On Fairy-Stories
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