Thanks for writing your query.
It is good that there are no clincal symptoms of internal injury in your daughter.
The marble sized swelling might be due to soft tissue injury
If no symptoms of concussion
appear and the child is normally active, you should not worry for the swelling. It will subside in few days.
If the problem persists or she develops symptoms of concussion, get her examined at the Emergency Department.
I hope this is helpful to you.