SOLVED. Children’s book main character travels to a tiny world. [s]

[Aslı]

This was a book I’ve read when I was about 9. The book was a novel about 300 pages long.Main character’s name was Jane. She had many elder brothers and she had a poor family therefore she was always wearing her elder brother’s old clothes and she looked like a boy. There was a new girl in her class and I specifically remember in the description that the new girl was treating like she had just came from Hogwarts. She carried a thermos with her and she was drinking coffee in breaks. It turned out she was some kind of princess in a small people’s world like Travels of Gulliver. This new girl also had a mother they were staying in a hotel and they were eating cakes. One of the bad character’s name was Fatilda. I am not sure about this but Fatilda might be name of the girl’s mother’s name. I think Jane was trying to save that world from Fatilda.
I hope this book can be found I really really wonder its name and I want to re-read it if that’s possible.

[Sirvantes]

The Little Secret, by Kate Saunders

[Rainbowheart]

The Little Secret for Sirvantes' suggestion.

[Aslı]

That’s it! I can’t tell you how thankful I am. I really appreciate your help. Many thanks :) You’re a star!

[Sirvantes]

Yay! Happy to help.