How do you get the fourth sister in the Legend of Zelda phantom hourglass?

Right to get the fourth sister head to the level where the 3rd one was and find a way down on the left side of the map i think Now you should be in a room with some oil cans and the order of the levers you pull is 4 2 3 1 5 i think then the spikes go down and head past there lift up the oil can to get her and get ready for a battle O and they lie!!