Magic Kitten: Seaside Mystery by Sue Bentley
Rainbow Magic with whiskers!
When Maisie moves to the seaside with her mum and dad she feels desperately lonely. Her best friends at home seem to have forgotten about her and her new school doesn't even start for a couple of weeks yet. Then one day on the beach, Maisie finds a tiny tabby kitten with big emerald eyes who looks just as lonely as she does, and suddenly a magical summer looks to be on the horizon . . .