I do hope it is a wind up - neither of the breeds she says her female is are common, so I can't quite see how you would end up with a cat that is half and half (although thinkig of the colour patterns for both, would be an interesting looking cat!!), and if she really wants to be a vet, she will have to change hr views. I would be tempted to e-mail her CP's leaflet about not letting cats have one litter.