Hello girls! My daughter will be 15 years old on January 13th, after N…

Hello girls! My daughter will be 15 years old on January 13th, after New Year's she has been feeling terrible!☹️ For two days already. She drinks chamomile tea. Soon she'll go back to school, I suggested taking a rest for two/three days, but she doesn't want to. She says that even with nausea she will go. But I don't need my child to go to school with nausea. I can't force her, but every time I make a suggestion she rejects it. Are there any other ways to treat nausea in teenagers? ?