Vet check will be needed. Maybe they have a medicine that will help her. Mine did the same thing though. Ate till she was home a few days, we had the same food as the breeder and she just stopped wanting to eat it. Like I said, it took MANY samples of different foods to find a few she liked... and a few months with force feeding, but she now eats on her own pretty well. Don't get frustrated, stay as positive as you can.
I remember cussing at her because she was fighting me, but saying it in a pleasant upbeat tone- lol- SHE MADE ME CRAZY!!! It was worth the effort though