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When you've shot her enough, she'll move to the corner, of the walkway. Shoot the barrels to take off a chunk of her health. Next time she moves, she'll move infront of the crane. When she does so, hit the flashing green button to your right and Albert's you Uncle, she's finished!
Sadly I can`t help at all as I don`t have the game. However, there is SR`s cheat/hints/walkthrough network that might be able to help.