This is the 15202nd most frequent Russian word.
понравилась
"Понравилась" means "liked" or "was pleasing" (referring to something or someone in the past, feminine subject).
The word 'понравилась' is used here to indicate the subject (the book) was found likable by the indirect object (her).
Она сказала, что ей понравилась эта книга.
She said that she liked this book.
In this sentence, 'понравилась' emphasizes that the idea (feminine noun) was appealing to the speaker.
Мне понравилась твоя идея для проекта.
I liked your idea for the project.
Here, 'понравилась' is applied to show that the new game attracted the children, highlighting the subject's feminine singular form.