First of all, do not panic. Get a checkup regularly with the operating surgeon. Mild discomfort in the first month following cataract surgery can be expected. It is variable in different patients.
Avoid touching the eye, wear protective glasses at all times and instill drops as advised.
Hope your mother gets well soon.
Next Steps
Follow up regularly as advised by your doctor.
Health Tips
Avoid touching/rubbing/wiping the eye which has been operated during the first month following surgery.