Thank you for your query.
Do not panic.She is suffering from post flu
Give her lots of fluids and rest.
The increased quantity of stool was due to witholding.
Give her some energy rich food and drinks.You can give her a short couse of multivitamin
If you have any further queries you are free to consult me.
Hope this answers your query.
Wishing a speedy recovery.
Have a nice day.