After a course of antibiotics to reduce infection,please have the tooth removed.If your mother has other medical conditions that preclude removal,consult with your dentist of the possibility of a root canal treatment(though success rates of root canals in wisdom teeth is not very high).
Next Steps
Start a course of antibiotics under your dentist's supervision,and schedule for treatment.
Health Tips
Please have your teeth checked up regularly and take up any necessary treatment before it gets worse.