2nd boss of the game. She's not exactly hard to be honest.
A hammer is the best weapon I found. Blades seem to do no damage.
A hammer with high damage and you want amulets and rings that add afflictions chances, this means the Hammer does not need to have any afflictions added as a bonus. This tends to add poison damage alot. If you want to stack it with others. Use a sword with fire or bleeding as it's allfiction.
She's very predictable, use your weapons abilities often. The reason I say Hammers are the best weapon is because the abilities seem to shred her health, also, max out the abilities skill in the skill tree, this means the abilities recharge at a stupidly high rate, making this boss a breeze.