Daughters Problems!

My daughter is 14 years old and Monday she woke up and she sat in bed rocking back and forward and I asked what was wrong ? And she said she has a throw-up feeling in her stomach so I gave her some Trix Yogurt cause I thought she would maybe be hungry and so she ate 3 or 4 bites of that yogurt and she threw up the yogurt and then said she felt better. And then this morning she felt sick again in the same spot and she said give me some yogurt and i did and she took 3 bites and threw it up and said she felt better ? What is this ????!