Kayle counterplay?

How are you supposed to counter a Kayle. She got dicked in lane, they had 2 towers left, but she hit 16 with zero kills, and suddenly is unstoppable. How do you play against something like this. We can't kill her because of her insane lifesteal/ult. We can't cc her because then we can't defend from the other 4 players. We can't play under turret because she melts us then takes turret in 3 seconds. What can I do against a level 16 kayle?
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