Often times females will have stomach upsets or lack of appetite after matting. Something in my guts tell me you are not experienced with breeding? Are you?
Have you tested your female to make sure there was no underlying issue going on before the mating took place? Usually it is advisable to run at least the basic blood work called organ screening, fecal and blood work for brucellosis. That if both parents are already investigated for the other genetic/ inherited diseases or conditions.
Another real possibility is always pyometra after a heat season. It is more common than we hear about it so a good vet visit to investigate the matter sooner than later should be done. If caught soon enough surgery can save the dog.
Good luck.
XOXO
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