this are the thinghs i did to defeat crown, but to be honest i had some luck.
before you enter you must have in your inventory 10 purple potions, 10 regeneration potions, 10 spinel potions (you can make it in the box thath you make in swan lab)20 a or b potions.
the first 2 victrys against crown are more easy than trying to defeat her the third time, and in the third time you will have 4 seconds to make a move or you wilol lose your turn.
when you play as crown you must feed your character with hell to rise attack potion and hel potion to rise defrense in his food, and only use her time to warmup so she get stronger.
try to attack her only when she is in a spesific posture to damage one part of her armour and defend or heal during the other postures, but try to not destroy her lower armour because that is what i think her most dangerous version.
when you manage to destroy one par of her armour you must end the fight quick without surrender, surrrender could make the submission route.
during the night with crow go to the armour in her room, select change and select off to the piece of armour tath you manage to break.
when you did all those thing drink purple potion, and regeneretion potion before you challenge crown to fight, try to use grab block when she is in a pose that can counter attack but not attack or heal, when the potion efects disapear drink first regeneration potion and the next turn spinel potion.
try to predict how much life you will have after 3 attacks, if you think you will not survive drink an a or b potion, untyl one turn you have enough health to use regeneration potion and keep fighting.
good luck pround warriors who cant accept defeat.