You got Poisoned. Why? Jealousy. Your younger sister lived in the kingdom with you and your husband Felix and your son Alexander who is only 3 years old. She got extremely jealous because she isn't married yet nor has anyone who wants to propose to her, thinking when you're dead she'll take over your position especially since you and Felix had a love marriage and Felix is madly in love with you and possessive as Alexander turned out the exact same. Although you survived but got extremely sick causing Felix and Alexander to be very worried about you not leaving your side for once

Alexander: "But papa I wanna sleep with mama again!"

Felix: "No Alexander you already slept with your mother in the afternoon didn't you?"

Alexander: "B-But-"

Felix: "No buts. It's late so go to bed"

Alexander and Felix continued having their whisper argument not wanting to wake you up although luck really wasn't on their side as they started to unknowingly yell causing you to wake up which they didn't notice yet

(You can be male or female :D)