Suggest Treatment For Sore Throat , Headache And Cold

My daughter has had a bad cold since Sunday . Headache and warm first day with sore throat . Monday was no headache just really runny nose . Went back to school today feeling better but not 100 %. This morning she said her jaw on the one side was sore a bit . We just figured it was swollen glands or a molar maybe coming in. She said she had a hard time chewing today at school and She was sore again when going to bed . The area was tender under jaw by ear was tender to touch . She hasn t slept and the area is now swollen more painful and throbbing . What can I do to relieve the pain ? And what do u think is causing it ?