My Best, Best Friend

Lola and Lotta are best, best, BESTEST friends who do completely everything together. They always pair up, they look after the tadpoles in the pond, and they especially always swap lunches. But when Evie, a new girl, joins the class, suddenly it's Evie whom Lotta does everything with, even lunch swapping. Lola tells her brother Charlie that she has lost her best friend forever, but Charlie isn't so sure.