Hi dear, good you have tried doing your part. Some infections are viral n they do take their own time to subside.
Next Steps
What is her diet now? Do not give her any milk or milk products except for curd. Give her rice n rice based items. Rice Ganji, veg soups, idli/ dosa without chutney etc.
Health Tips
She will be fine. Increase her intake of water as she should not feel dehydrated. Please do consult here for further details.