A stray showed up on a front door recently. We took her to the vet and she received all her shots and he deemed her healthy. She was also tested for all diseases she could give to our other cats. Shes been skittish since we took her inside . She has been eating healthily. Today she refused to eat both wet and dry food and stunk up the entire room she has been staying in. The smell is similar to sour milk. What could possibly be wrong with her? Our vet is closed for the next two days. Help!