Poor Billie is suffering from a slight phase of confusion these days. She thinks she is pregnant, or rather, she thinks she just had puppies. She had all the symptoms of pregnancy, and when the time came for her imaginary due-date,  she started to follow the kittens around the house, licking them, whining, distressed and restless.
She also suddenly does all sorts of weird things. Like chewing up a plastic bag, or running home when she was let off the lead in the fields. Or deciding that the sofa is hers.
I feel for her, poor woman. I think I'd be a little psycho too, if I thought I had puppies and they turned out to be kittens.