Suggest Treatment For Vomiting In A Child

hi, my six year old daughter used to drink milk normally but since last three weeks , she vomits a little milk in the morning...while drinking....and then finishes the whole glass..And she doesnt vomit after that. She is normal whole day and eats n drinks normally and is perfectly healthy. She has always been a fussy eater and takes time to eat and drink .Hence i usually reserve 30 -40 minutes in morning for her to drink milk and then she carries breakfast to school which she eats without an issue. But dmaking her drink milk in the morning has become a problem coz of this.I cannot skip milk coz she eats bf from school only at 9 and she refuses to eat early morning since she was never used to it.She has been drinking milk early morning ever since she was 3.