felicia is in the vault in b2 of the mine.
i dont remember the specific strategy for victoire. but she will oneshot you as ren and kiri once she drops below 25%. it is possible to win there, but she will still proceed and emi will break free.
every 4th turn she'll either cast cure or heal...but since cure costs mp i guess she just heals. I can't really gleam what her weakness is from looking at her stats.
the golems die immediately if they run out of mp btw. in case that helps. but i guess youre doing the first part of the fight right if youre getting hit for 5k
looking at emi's skillset i think you can stun her with dope slap. and armor break her... some healing items wouldnt go amiss either.