Answer:
they passed through a brief blossoming-period of beauty, they married at twenty, they were middle-aged at thirty, they died, for the most part, at sixty.
Sacrifice... Not all heroes are successful for a while...
She is still unable to connect to any maternal source of wisdom. Ying-ying as an adult has pushed this memory away until she sees Lena suffering in a loveless marriage. At that moment, Ying-ying remembers the wish she wanted to tell the Moon Lady: she wished to be found.
To conclude the question your answer would be, Man vs Society.