Thank you all again for your help. We took our Honey Bunny to the vet and she had a full check-up and she is absolutely fine. So in fact the vet says it must be some sort of an allergy to the prawns. It's such a shame, but she now has developed a passion for Queso Manchego (Spanish cheese) especially the really EXPENSIVE vintage one. Honey Bunny is a lady of very refined taste!! She send oodles of kisses to you all