My Nine Year Old Daughter Vomit Yellow Bile But Doesn't Have Fever

my nine year old daughter vomit yellow bile but doesnt have a fever my nine year old vomit yellow bile but doesnt have a fever then two days later vomits again,what could this be?she recently stoped taking allergy pills .she hasnt eaten any bad food,shes not sick or anthing like that,she vomitted in the morning,then 2 days later again at night and yellow bile came out.i give her juice plus gummies