Basically what CPUAquaHeart said but if you're more of a physical character and invested in power there's a trick to oneshot her with the demon layer. You have to stack buffs so first you put on "Overlimit" (which at roughly 90 or so power will give you a +50 power boost), "Moxie" and finally use "Power Up" which stacks with power so if you have 90 power should boost your arousal damage by roughly 200%. at which point you use your demon layer.
You'll want to make sure you either have decent technique or high enough energy to be able to resist failure btw she'll always attempt to dodge the demon layer. So once you hit her with your truck full of extra damage you deal roughly 2000 arousal in one hit essentially one-shotting her.