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I think one of my turtles got bitten by the other turtle.. and now i see that her eye is like.. bruised or something... its almost likewhite and its a little bigger than the other eye, and the turtle has been acting different ever since...

Normally she's swimming aorund like crazy, but now she's just sitting on the bottom of the tank.. and wont even move when i move the food can in front of her...

What should i do ?

Also, the "bruised" eye looks like its transparent or something.. i can kind of see the eye inside..

Are you talking about the eyelid? They do have an opaque eyelid behind which the eye/pupil can be seen.

Is there any actual bite mark or scratch mark? Does the turtle appear to be afraid of the other(s)?

How many turtles do you have in the tank? How big is the tank and how big are the turtles (shell lengths without the curves)?

If you think the turtle is being injured by another, it would be good to consider separating the turtle and putting him in his own set-up.