Once upon a dance

Ella Tale
17 year-old daughter of a multi-millionaire who remarried after his wife's death. She didn't stand out in high school and she wasn't bullied, her stepmother loved her over anything in the world along with her little step-twin sisters, Anastasia and Drusella, aged 8. She got good grades but she wasn't a nerd. She had a group of friends that cared for her and the two most best friends she could ever ask for.

School starts again after a long summer and she's a senior now.

But she's not all of a good girl entirely. She used to be one. She used to be innocent and happy. She changed.

It all happened because of that one dance back in spring of her junior year. After that she didn't come back to school anymore. She stayed in touch with her friends but no one knew what she was up to. Until she appears in the school gates with her friends on the first day of school.

She's not Cinderella anymore.

...

Book #1 of the Once upon a time series by Frances Lutz.
And I suck at descriptions, please read the book anyway!