"And Ahab told Jezebel all that Elijah had done, also how he had executed all the prophets with the sword. Then Jezebel sent a messenger to Elijah, saying, “So let the gods do to me, and more also, if I do not make your life as the life of one of them by tomorrow about this time.” And when he saw that, he arose and ran for his life, and went to Beersheba, which belongs to Judah, and left his servant there."-1 Kings 19:1-3
It's understandable how Jezebel got furious after realising that Elijah killed all her best prophets but if she was supposedly so angry about it, why did she decide to curse herself? Why not be explicit and tell Elijah that he should be killed without all of the fancy language? She certainly didn't put on this act when she decided to coldly organise Naboth's execution. Quite counterproductive for an ambitious queen hellbent on vengeance and bloodshed.
Was Jezebel trying to get into Elijah's mind, trying to disturbingly suggest that maybe her god(s) truly existed? Or was it just simply her trying to sound self-righteously pious or conversely, being extremely nihilistic? Imagine the immense foolery Elijah had to put up with.