What Bad Intentions Does the Daughter-In-Law of the Hou Family Have? Just Usurping the Throne

In her previous life, Fu Anning was the most dazzling woman in Kyoto, but she was entrusted to an evil person and ended up with her entire family ruined. After her rebirth, she vowed to make the heartless man pay the price and completely trampled the white lotus into the mud so that her brother could see the man's true face as soon as possible and her father could be prepared. There are many princes, and since the sixth prince is ruthless, wouldn't it be easier to handle the frail and helpless eighth prince? Everything went according to Fu Anning's plan, but it was discovered that the eighth prince was actually the one pretending to be a pig and eating the tiger... Doesn't it mean that you can't leave the imperial mausoleum without a summons? Why did he sneak into the Hou Mansion every two days? Doesn't it mean he is frail and sickly? What's the matter with Shenlong's ability to see the beginning but not the end? Doesn't it mean that you are helpless? What about those highly skilled guards?