Ever heard of something called Zylkene? It is a herbal remedy that really sends them into chilled land! Again available on Amazon. They like it too, something to do with mimicking their mum's milk. Perhaps you could put it on a bowl of food out in the garden and let her eat it and then see if she chills out enough to come in. I also agree she might come in if you all go out. As you know they sense the vet!!!!