If poop and energy is normal, and she is still drinking water and eating treats, I would just give her some time. My puppies occasionally go through phases where they just aren't hungry for a day or two and then go back to normal. I've also put a little bit of low-sodium chicken broth or warm water in the kibble to tempt them to eat again. Is she still just isn't interested, you could try another kibble. If she continues to refuse food longer than three days, I would take her to the vet just to be on the safe side. Out of curiosity, what kibble is she on?