To beat her keep moving from crate to crate, when she stops fire a rocket or bomb at her, I recommend the bombs, there quicker. She'll stagger each time you hit her just be sure to keep moving, try the tex arrows too if need be, they cause a lot of damage. Eventually you'll have to run to the large crate in the distance for more ammo, just be sure you've got some distance between you and her before running for it and watch out for the lava pools, make sure you jump over them.
There is a turret here but I wouldn't use it, you'll be a sitting duck for the T-Rex. Finally there's an SMG near a crate, if you can get it you can nail the explosive cannisters when she passes them it'll help...otherwise just keep hitting her with the rocket launcher and sticky bomb gun and eventually she'll drop. Once she does equip the knife and stab her when the button icon appears and you'll get the final kill sequence.
Hope I helped
[Edited by assassinxxx, 2/3/2009 4:29:37 AM]
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