Hello and welcome,
Thanks for your query.
Your mother's presentation match's that of a person with either a GIT (gastrointestinal tract) infection or even indigestion
Also possible are GERD
(gastro-esophageal reflux disease), gastritis
Without an elaborate examination and a few investigations, it is difficult to establish a diagnosis.
I request you to kindly consult either a gastroenterologist or a Physician, who will be able to diagnose and treat your mother for her symptoms.
Do not panic, and help her by consulting a doctor.
For any further help or guidance you can always write to us.