There's an icon door before the waterfall. Go down the chain and up the stairs, across the bridge and out the door. Up the lift and pull the lever. She can come through to you now when you open the grate door.
Take her down the lift and up the blocks, across the bridge. Save at "Waterfall" save spot. Bring her out by the grassy area. Now go back up to the very top. Swing across chain to the archway walkway, down ladder to grass. Pull her up with you. Go back up the ladder with her, across to the other ladder, in the door.
Go up the giant ladder, across the pipe. Onto the ledge, over to the 2nd pipe. Onto the ledge and the 3rd pipe. See the water flow. Push the block in - it goes over the falls. Now pull the lever left of the door to open the door and get the girl out.
IMPORTANT NOTE: International players have a slightly difference sequence above. They can't get across all of the pipes. Instead, there is a device down on the floor. They have to turn on that device and get on the platform next to it. Time a jump right when the platform reaches its top point to leap to the next area.
Go to the end of the stream, up over the opening, back and up to the turning circle lever. Turn it around twice to stop the water. Go int he stream bed and jump out the mouth. Cross the bridge and save.
Go down to the bottom, kill a few monsters and go up the block to the idol door.
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Review of Ico