K.L.
You really should take her to the doctor before next week - vomiting in children, even if only once or twice a day, can severely dehydrate them (dehydration can cause a slew of other, more serious health issues such as increase blood pressure, fever, and collapsing veins). Regardless of what is actually causing her to vomit, it is NOT normal for her to be spontaneously throwing up when she seems normal otherwise - it could be a sign of some more serious problem of which vomiting is just a symptom. Call your ped and see if he/she thinks an earlier dr's appointment is warranted.