Wecome to HCM
It seems your mother is suffering from Gastroenteritis
usual causes are bacterial infection or amoebic infection.
The medicines which your mother is receiving are perfectly allright and she should improve soon,I hope so.
If she is dehydrated care must be taken to rehydrate her and if she can take orally she should continue to take sufficient fluids.
As she is in hospital a CBC,Kidney
function,serum electrolyte must be done to know the status of organ function.
I wish her speedy recovery.