Place it in a sealed container with dry rice. Let it sit for about a week. DO NOT TRY TO TURN IT ON.
IF, you can completely dry it out....there is a possiblilty it MIGHT still work.
Otherwise, its good for parts. Its not worth fixing unless you can find another broke iphone (one that the screen is broke, circuitboards are good) cheap and swap parts.
PS - Bet she wont do that again.....I couldnt resist
