Thank you for your query on Healthcare Magic.
Your child have developed a hematoma
which is a collection of blood below the skin.
Nothing to worry as she is acting normal.
But observe of at least 24 hours for danger symptoms and signs like vomitings, fits
, bleeding from nose and ear, abnormal behavior, and decreased limb movement and if you find any abnormality report to ER immediately.
For pain and swelling you can apply ice packs intermittently. Ibuprofen
can be give in prescribed dose if the pain is moderate to severe.
I advise you to consult the pediatrician
for the examination of your child for any abnormal signs of head injury
and to manage the wound.
Hope I have answered your query.