Where do you find that out? I had guessed she was a lot older than everyone else but no where has it been out right stated to me.
I've been abusing my save before you choose who to s rank with and I've gotten pretty good at blitzing through the last two maps with just four people, I did the first one properly and saw Sothis's S-rank.
I also did one to see if theres a cut scene when no one is chosen, Flyne's and if just done one for Mecedes.
And just incase anyone was curious what "team" I was using it's Great Lord Dimitri, Bishop Mecedes, Dancer Flyne and Enlightened Byleth with the chalice from Cindered Shadows equipped.