Thank you for your query,
Due to head injury
she developed a contusion
on forehead due to accumulation of blood in scalp layers.
Just look in to mouth for any injury inside like laceration or cuts and any loosening of tooth or tooth mobility
There may be hit to back of the head also as she is complaining of tenderness.
Observe for abnormal signs like vomitings, abnormal sensorium, bleeding form nose or ear and if you find any report to emergency immediately.
You can give Tylenol in prescribed dose for pain relief.
Consult your Pediatrician
to assess her injury and neurologic status and dentist
referral if it is required.
Hope I have answered your query.