good afternoon, as u think it is not acid reflux
, as it will present by repeated vomiting
and some times cough due to vomiting, if it were to be lactose intolerance
, she would pass curdy stools with a blast of flatulence
along with the stools in small quantities frequently and there would be rashes in the diaper area. what i think is that she might have contracted gastroenteritis
. so get her stool analysis done for stool routine and stool for culture sensitivity.meanwhile maintain her hydration, watch for bloody stools which requires medical attention. will review with the stool reports. thank u.