Dear practo user,
Your mother is most likely suffering from peptic ulcer disease or we commonly say it as gastritis. Occasionally it exaggerate. So nothing to worry.
She needs some antacids and diet modifications.
Next Steps
avoid spicies, oily food. walk for 10-15 min after meals.
for treatment kindly consult at nearby clinic or online.
Health Tips
at her age kindly get her cardiac profile checked. left sided stomach pain is sometimes cardiac in origin.