I imagine she'd start the fight with two Kawkaws by her side and she'd be more of a support enemy, maybe pushing the soul with wind or slowing it down. If she does attack directly it'd definitely be by shooting feathers as darts basically. I imagine that, to win her fight, you'd have to have both of the enemies with her meet their spare conditions before you can start working on actually sparing her. If you defeat a Kawkaw through violence or cause it to leave by shooing it, Lady Karasu calls for help and another enemy appears in its place (usually a Kawkaw but I think it'd be funny if at one point a Leafling appeared instead, Karasu scolds it for not fitting the battle, and then it leaves and comes back in Kawkaw cosplay).