The Phoenix Returns to Its Nest: the Counter-Attack Begins in the Cave

[Rebirth + True and False Princess + Heroine + Online IQ + Machiavellian Court] Lin Wan died once, being pushed into the high seas by her husband and best friend. When she opened her eyes again, she became the eldest princess of the Dalin Empire. Same name, worse way to die. Being abandoned in the wilderness, two soldiers were preparing to "deal with" her. She killed two people, and then said something to the prince's confidants who came to "collect the bodies": "The good show you have been waiting for for the prince, I have finished for you." … The whole capital is looking for the eldest princess. The fake princess put her face in front of her and held a banquet for guests at the princess mansion. The real Lin Wan was sitting in the prince's side hall, sharpening a knife. The prince thought there was an extra chess piece. The Sixth Prince thought there was one more dead person. The fake princess thought she was in a trance and her memory was blurred. No one knew that she sneaked into the princess's mansion through a secret passage every night and put the evidence of the sixth prince's crimes in her sleeve. No one knew what she was thinking when sharpening the knife. She wasn't thinking about revenge. It's a question—— How did the queen mother die back then?