How long can a fever last?? x posted in vax

I posted yesterday that my daughter came home from camp with a 103 fever. She is complaining of a really sore throat (i'm worried about strep). She has had a fever since Wed (at camp it was 102). Im getting worried that there's something really wrong. How long can a fever last? Is this dangerous? Will the vit c really "work"? I'm so brainwashed by dr's that I want to load her up with motrin and take her into urgent care. I know it's probably not the right thing to do....but can you explain why? thanks mamas.....just really scared here