What did Jezebel do when she heard Jehu had come to Jezreel?

Answer: Put on makeup and did her hair

Jezebel painted her eyes (KJV: face), adorned her head and looked down from a window, taunting Jehu as he came through the gate.

“Now when Jehu arrived in Jezreel, Jezebel heard of it. So she painted her eyes, adorned her head, and looked down from a window.”— 2 Kings 9:30 (BSB)