Looks like she has Bell's Palsy on the left side of her face.
Bell's Palsy Fact Sheet | National Institute of Neurological Disorders and Stroke
What is Bell's Palsy?What are the symptoms?What causes Bell's Palsy?Who is at risk?How is it diagnosed?How is it treated?What is the prognosis?What research is being done?Where can I get more information?www.ninds.nih.gov
What makes you say that?
Someones face permanently droops after severe facial wounds/trauma, i think it's more likely there was unfortunately nerve damage.
Nerve damage often isn't something medical science is capable of fixing, unfortunately.
