Hi Webberh,
Thanks for writing your query.
Black eye along with swelling around the eye and headache is common after an
injury as mentioned by you. The
soft tissue around the eye is such that blood easily gets collected around the eye resulting in black eye and swelling.
You should not worry much about it as it will take few days to weeks time for complete recovery.
Apply
cold compress as it will decrease the swelling to some extent.
If the pain and swelling is more, she can be given anti-inflammatory medicine like ibuprofen(
advil) after meals.
Proper rest will help her recover quickly.
If there occurs some problem in vision or if the
redness in eyes increases, she should be immediately examined and investigated by an Ophthalmologist.
I hope this is helpful to you.
Thanks.