The Diddakoi  (English, Paperback, Godden Rumer)

A diddakoi is a half-gypsy. But Kizzy feels like she is all gypsy. She doesn't fit in at school - the other children attack her and call her names. Still, she is happy living with her gran and old Joe, the caravan horse. When her gran dies, Kizzy turns to the Admiral for help.