The main characters are 13ish year old girls---Louisa, Rosie, Evelyn, and Maddie.
Elle Fanning as Louisa
Selena Gomez as Rosie
Willow Smith as Evelyn (yes, I pictured Evelyn as more of a "geek" because of her conspiracy theories, but it was Willow's face that I kept seeing.)
Ariel Winter as Maddie
Who did you cast in your mental movie?