What power can I add to my Water Elemental hero to beat a Kryptonian without Kryptonite?

Kristen Base Powers:

Absolute control over all phases of water and some Gravity manipulation. This means she can create metallic water armor, metallic water weapons, and just rip the water molecules right out of her opponents' bodies just by willing it to be done. She can also transform into any phase of water.

I was considering adding total control of Lightning and Fire in case people think water isn't enough for this challenge.

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What power can I add to my Water Elemental hero to beat a Kryptonian without Kryptonite?
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