Thanks for your query.Your mother who gets Urinary stones repeatedly has recently undergone ESWL
for Lt kidney
stone.This is one of the known methods foe treating Kidney stone .As the stones get fragmented the bacteria present in nidus (Centre) of the stones are liberated and they enter in to general circulation causing infection of the kidney..This is the reason patients get swelling of the face However it is a temporary phenomenon .Please get her following Investigations done..
1) Blood Urea
2) Serum Creatinine
3) Routine Urine examination.
Please ensure that she drinks plenty of water.Things will settle in a week.