Anticoagulation after Mitral valve repair is required for 3 months . Then it can be stopped and antiplatelets like Ecosprin can be continued.
However if the patient has other indications for anticoagulation like Atrial Fibrillation, Rivaroxaban needs to be continued.
Can take vaccines while taking these tablets.
Next Steps
You need to find out the reason for prolonged anticoagulation in your mother by consulting a doctor