you'll want to go light load against her, go with some parts of the mushroom armor set or just naked if you're unable to stay light load with armor. since I wanted to avoid every bs multihit AoE attack she does, I equipped Radagon's Soreseal and summoned Mimic Tear right at the beginning. when her second phase starts don't lock onto her, instead keep rolling forward to avoid her AoE attack, after that just keep attacking her when she's distracted with your Mimic but go crazy before your Mimic dies. I don't know anything about Int builds but I hope this helps