Após uma longa pesquisa, acho que a encontrei: Lizzie Dripping por Helen Cresswell .
No-one in the village believes that Lizzie's seen a witch! But Lizzie doesn't care because she knows that in all Little Hemlock there's no one half as interesting as this witch - and besides it makes life far more exciting to have such an unusual friend.
Capa azul, o original foi publicado em 1973. Faça o check-out .