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I see that you have tried disguising the antibiotic in food.
The fact that she has vomited each time that she has taken this antibiotic may indicate that she is having an adverse reaction or "allergy" of some type to this antibiotic.
I would suggest contacting her physician to see if another antibiotic would be appropriate.
If she is being treated for an ear infection, one possible alternative would be an injection of Rocephin (single does can be effective)