Thank you for your query.
I can understand your concern for the frequency of diarrhoea
that your daughter is having. She is getting the appropriate treatment. The main stay of diarrhoea is that the child should not get dehydrated which you are ensuring.
Coming to your question, it may take 2-3 days for the diarrhoea to get controlled. If the time interval between motions is increasing and the consistency is changing to semi-solid then one can be sure that there is improvement. You should ensure that she gets adequate fluids and is passing urine every 4-5 hours.
I hope I have answered your query to your satisfaction.
Wishing your daughter an early recovery.