
Is she lossing alot of weight quickly? If she's not loosing too much I wouln't worry just yet, a dog won't starve themselves. And if she's eating a little each day then something is going into her.
For phantoms I normally reduce food and up exercise and mentle stimulation and have never really had a full blown phantom using this method. Most times it's about keeping the bitch's mind off being in whelp. :)