stay to her front-right side and you should be able to roll through her melee attacks and attack while she's in the attack animation. It's a matter of learning all of her different attacks, you need to know when she's going to do that AOE blast and get the hell away. If you're around SL20-30 I can try to help you later tonight.
- lock on and circle strafe forever
- hit it when it stops to spit fire
- watch the sexy part closely because when it droops it does the aoe explosion
- you can actually stay UNDER its front legs on either side and strafe/attack safely without getting hit by any attacks the whole battle, although you will have to watch for lava/explosion
Two hand your weapon, hack that ho everywhere, then roll back when she leans down to embrace her spiderhead--that's when she does her AOE explosion. Just stepping back owns her swipes and you can move to the side to avoid her stabs, which have looooong, telegraphed animations.
Finally, when the area you're in gets clogged up with lava, just run to the other end to effectively reset it. The area is huge for a reason.
Thanks for the tips guys! I do manage to take a big chunk of her life. But then I die. I ain't giving up that easy though. Also I thought its a pretty neat design choice to have a spider spew lava instead of web.