Manga by author 两只猫 Liang Zhi Mao - Status ongoing

A Queen's Law of Survival summary: She used to be an immortal. She gave up her immortality for eternal love, yet was betrayed by the one she loved. In a twist of fate, she was reborn as a queen in another world. Now, she is faced with the ever-impending danger of being sacrificed by her cold-blooded father to her brother. Can she find a way to rewrite her destiny...?