... No. This was weird and kind of bad.
First, the stealing by all the maids, the knight, and the nanny. It came out of nowhere as a complete ass-pull to make it easier to get rid of them all. No buildup or anything. And for what? To... More easily get them out of the story? Why? She couldn't just change their opinions of her like she is doing with the emperor? The author had to kick them out of the story because... Why?
And then there's Philomel herself. A comment on chapter 6 phrased it well. She isn't a reincarnated person. She's still a 9-year-old child who just read a book. She doesn't have the maturity, life experience, or maturity of an adult. She is literally a child that just a few weeks ago was consistently skipping classes, disobeying rules, and throwing tantrums. And after she reads a book, she now acts with not only the mental maturity of an adult but also the wisdom to carry out a plan like this? This weird, probably unnecessary plan? Even though the plan is weird and unnecessary, it still is not befitting of a child.
She read a book and believes the book is a prediction of the future. I've met children who read books and think those books are about the future. They don't act like this. This is kind of bad.