Ad le Geras 
Rival For Louisa [EPUB ebook] 
Red Fox Ballet Book 4

Phoebe’s new to the ballet class and Louisa (aka Weezer) takes an instant dislike to her — she’s pretty, posh and worst of all, a good dancer too! When they’re both picked to play in THE NUTCRACKER, Weezer is super smug — she’s got a big part and Phoebe’s just a measly mouse. BUt as rehearsals progress, the pair find that actually they rather like each other, and when Weezer hurts her ankle, it’s Phoebe who’s able to save the day.