Hi welcome to HCM .
Sometimes it is common to have pain around the eye post operatively. As long as her vision is good without any increasing signs of redness
or discharge she need not worry. A dose of paracetamol
tablet can help her as temporary relief for pain.
If she continues to have discomfort , she can review with her surgeon(as its almost one month post op period),to be free from tension headache
. Take care.