Welcome to the forum. You should have your daughter examined clinically. The symptoms are indicative that the wound had not healed. She needs to get an X-ray done to rule out any fractures
The swelling/lump should be assessed for any fluid, blood that might be inside which is causing discomfort. Neglect will result in infection, pus-formation and complications later. If the lump has fluid inside it needs to be drained. It is a small procedure.
Analgesics, antibiotics , proper dressing and treatment will help your daughter get well soon. For temporary relief you can give her analgesics, but that is not an answer to the problem through which she is going.
Take immediate medical help
. Take care.