Elephantom by Ross Collins

When a phantom elephant turns up uninvited and starts getting a little girl into trouble, she has no idea how to make him go away. But her grandmother, with a menagerie of phantom pets herself, advises her to visit the Spectral & Son shop, as this strange place can sell her the solution - a box that lets her give the elephantom to their next door neighbour!
Binding: Paperback / softback