How do you deal with Illaoi's Ultimate when she has an 85% slow?

Okay, not a Silver *insert champ* hate thread, just an actual top lane player that has been wondering ever since 2016, how the fuck do you just "walk out of her ultimate" when she slows you for 85%? I never understood how you just "walk out" 4Head when she can just walk up to you again and beat the living shit out of you. I just need help.
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