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Sodium at such a low level could be ominous. She may need more investigation to diagnose and treat it.. Usually it is dilutional / prolonged and with cough
, CT lung may be necessary
Problem in walking may be from the drug...
It is wiser to be under observation and investigation, observation and treatment in a multi-speciality tertiary care hospital – till things are sorted out..
Discuss with your doctor
Wishing speedy recovery