K.,
You should be worried about the throwing up as this means that she is not getting her proper nutrition. I am a midwife, and a Physician Assistant in the state of PA. The continual vomiting can cause the enamel on her teeth to go bad, albiet these are her baby teeth and she will get her adult teeth after awhile, but in the meantime, she is damaging her teeth and probably her esophagus as well. You need to take her to her pediatrician. There is no advice from any mother that can replace the advice of a professional.
Let me know how you get on with the situation, I will pray for her recovery from whatever is causing this.
I hope I have been of some help.
Sincerely,
J. T