you’re right, a branch of her facial nerve was probably affected during the trauma. The numerous branch of facial nerve controls almost all the head’s motricity.
Once the acute phase of the trauma has passed, it is often time that tells us how far the affected nerve can return to its functions but some therapy like electrostimulation can help.
Ask your veterinarian for advice, he will tell you what treatments are possible or not according to the examination of your horse.
Good recovery for your horse
The Zoetis team
This happened several weeks ago, and I wonder if she hit her facial nerve.