A. either she is eating too fast (there are special bowls to prevent that) or she might be intolerant to one of the ingredients in her food (even if it's a good food).
It could also be a medical condition (megaesophagus, tumor, foreign body in stomach). But if she is overall ok - start with a special bowl to prevent her from eating too fast. If this doesn't help try changing to a different brand of food.
If nothing helps, take her to the vat in order to try and diagnose the problem.
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