Hi
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If it is non stop diarrhea with the person passing about 15-20 stools per day then rush to ER. If it is less than 10 stools in 24 hours, then she should eat light, not stay hungry but eat simple things like toast, porridge, cereals, crackers etc. Take ORS. Take over the counter antacid and antiemetic (this SOS for vomiting). Watch out for a day or two with this treatment. If still the symptoms persist, then she may need an antibiotic for the gut and would need to see a doctor.
Please go through as advised. In all probability things will settle down. At any time you feel that symptoms are worsening (more than 8-10 loose stools in 24 hrs, vomiting, feeling faint, high fever etc) please go to the ER. Take care!
you could have a viral infection coming