I defeated her somewhere at level 62, but I can tell you this, she has a very strong weakness for aphrodisiac, I had enough to throw at her several times so that every round she gets 100-200 units of damage and she puts very dangerous debuffs on you, she has a debuff that takes 40 units of your willpower, and because of this you get more damage, so a good advice here would be to increase willpower to at least 45-50 ,+ various items that increase characteristics, she can take a capture from which it will be impossible to get out, but this capture is gradual and takes her 4-5 rounds, so a good option would be a teleportation skill since it allows you to get out of any capture, it is also good advice to buy panaceas and powerful potions due to the fact that it imposes charm and aphrodisiac, I myself put an aphrodisiac on it and waited until it takes away enough health, but at the same time I will have to constantly use potions since she will not sit in place