Kara Zor-El a.k.a. the Maid of Might, Supergirl, is the cousin of Superman. She was a teenager on Krypton, but the rocket that brought her to Earth kept her in suspended animation.
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Supergirl has all the abilities of her cousin, Kal-El. However, she's not quite as used to pulling her punches.
She's also considerably smart, even by Kryptonian standards.