Thank you for the input.
From her history it sounds like Hand, Foot, Mouth disease.
Similar illness can be caused by enterovirus.
Usually the illness subsides with supportive treatment in a week.
In most cases there is excellent recovery.
Sores in the mouth can cause difficulty in sucking & less intake.
You are following the right measures.
Maintaining hydration, keeping the temperature
lower by antipyretics like Tylenol/ Motrin are important.
As she is passing urine normally, it seems she is well hydrated.
If you have any query, please feel free to ask & continue conversation by using reply button.
This will help me to explain further & satisfy you.
Wish her healthy life.