I also tried this way and succeeded. I'm 105 cb, 76 att, 76 str, 77 def, 77 range. The first time I tried a combo of range and melee (potted and with broadbolts), took sharks once and rocktails the next, and only ever got her to a little over half health before I was near dying and had to tele out. With the dragon spear special I used half an inv of rocktails and poof! Was done! Easy peasy. I highly recommend melee armor, prot from mage, and dragon spear spec to fight her.