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I would suggest picking it up the moment she walks away instead of waiting 30 minutes, then trying again a couple more times a few minutes apart before giving up.
Her weight looks great so maybe it is just a change in calorie needs. Might need to feed her less in PM and AM if you want to do two feedings.
Those are my first thoughts.She is vomiting most likely because her body is reacting to the expectation of food at that time – which can happen when the dog is on a routine that suddenly changes.
Does seem a little weird that it would happen so suddenly. Be sure not to add anything to make it more tastey, because then it becomes expected and you get more nose turning to the food when the extra stuff not there.
Keep me posted.
