Quick Transmigration: My First Female Skill Takes Effect

The ratings just came out!
[Parents are biased + The female lead is not naive, not lazy, and feels no guilt (the parents' children are hers) + Reincarnated]
Mingqi, a spirit who has transformed into a human, disturbs the work of the underworld staff day and night, and occasionally emerges to scare other ghosts, prompting many to protest to King Yama.
The King of Hell looked at the ghost sneaking around picking things from her storeroom with a headache, and made up his mind—to let Mingqi grow up in the small world (to play), giving the ghosts of the underworld a period of peace.
So, just as Mingqi came to pick something up, he deliberately gave her a blue, thumb-sized key that was perfectly shaped and gleaming with gold.
Mingqi quietly reached out and, grinning, slipped the key into her pocket when no one was looking. But the next second, she was enveloped in golden light and disappeared into the underworld.
......
The first historical fiction world: Reborn female supporting character's younger sister
The educated youth office came to their home to mobilize candidates for the rural resettlement program. The family members stood in a row, and the reborn female supporting character listened expressionlessly as her father excitedly told her mother, "That's great! All the children from the eldest to the fifth have gone to the countryside. Our Bao'er is the eldest and the only child, so he can stay in the city."
Reborn female supporting character: "..."
The second palace intrigue novel world: the male protagonist's sister
A reborn noblewoman, whose clan was wiped out by the fourth prince in her previous life, wants to marry the prematurely deceased crown prince, save him, and block the fourth prince's path to power. However, at a palace banquet, a chubby three- or four-year-old girl, head held high and chest puffed out, pointed at the country and declared to everyone: "Father is the great emperor, and I am the little emperor."
The Marquis's daughter: "..."
Your Highness, say something.
Crown Prince: I dare not speak.
The third world of true and false heiresses: the female protagonist's younger sister