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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.I am sorry for her symptoms.
From your description it seems to be a viral fever.
In viral infection, there can be lethargy, dehydration.
So, she is tired, weak.
Enough rest and sleep are needed in viral infection.
Encourage her to take more fluid.
Viral infection usually lasts for 5-7 days.
If she develops unusual symptoms, then take her to doctor.
Otherwise, do not worry.
I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish her healthy life.Regards.