Poison Ivy: I must confess, the combination of heroic derring-do and anatomically-correct rubber suit puts fire in a girl's lips.
Batman: Why do all the gorgeous ones have to be homicidal maniacs? Is it me?
Robin: I want a car! Chicks dig the car.
Batman: This is why Superman works alone.
Mr. Freeze: Tonight's forecast: a freeze is coming.
Mr. Freeze: Allow me to break the ice. My name is Freeze. Learn it well, for it's the chilling sound of your doom.
Mr. Freeze: Freeze in hell, Batman!
Alfred: There is no defeat in death, Master Bruce. Victory comes in defending what we know is right while we still live.
Answer: Maybe she drained the cryo-tube first? Maybe she did get wet but had dried off by the time we see her again? Maybe Bane did it for her? Pick whatever answer works best for you. It's a really small, insignificant detail in the film with plenty of potential answers.
TedStixon
Thanks though keep in mind she wouldn't have a clue as to how it works since she's a botanist not a scientist in cyro genetics.
Rob245
She pulled the plug on the thing so Nora died and the tank drained (either automatically or Ivy did it). She just took the necklace off the body.
lionhead