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Considering the information you have provided your daughter does seem to suffer from gastroenteritis
and which warrants treatment . The most important thing you can do is to keep her well hydrated and well fed. Oral rehydration solution given as sips throughout the day may help her feel better .
Apart from this probiotics and zinc supplements given twice daily usually decrease the frequency of diarrhoea
and help in faster recovery. If despite such treatment for 3-4 days , the diarrhoea persists then an antibiotic like Cefixime
is usually prescribed by the doctor .
So kindly consult a pediatrician
for an evaluation and management as her condition is not very likely to resolve without supportive treatment .Please do not worry as this seems a minor infection and is likely to resolve completely with treatment .
Hope I have answered your query.