If I asked my coworker specifically not to do one of my tasks while I'm on PTO, and she did it anyway, what would you do?

This coworker listens like a 5 year old, and I'm feeling frustrated. Would you let it slide or say something?

If I asked my coworker specifically not to do one of my tasks while I'm on PTO, and she did it anyway, what would you do?
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