you need to have the cursed item of werewolf on you since her attack will not do any damage to you apart from the grapple attacks. you also need to have at least 25 - 30hp for the full corruptive transformation. you'll know when you've got it because your skin tone will change to match the werewolf. also you'll need to have been unbirthed by her prior to it for the full effect with the Btch collar
you need 30hp and the cursed artifact to be able to withstand her attacks long enough to transform. you'll know if you've done it right because you character will change skin tone to a light vanilla color below you'll find the two states of corruption the first being captured by her at the end of the run at the outskirts 
