My daughter has sore throat, earache, chills what could this be?

Enough to See MD. Many things cause these symptoms. Flu, ear infections, strep throat to name a few. See your doctor.
Depends. It depends on a few things. One would be her age. If she is a child, I might be concerned for an ear infection. If her symptoms started with congestion, the earache might be from the congestion causing pressure on the ear. A decongestant might help. If this is the case, it is likely a virus but you may want to see your doctor to be sure it's not an ear infection.