Thanks for your query.
with respiratory symptoms and rash points towards some viral illness.
Since fever is high grade i suggest you to take her to doctor for re evaluation.
In the meantime give acetaminophen
every 4 to 6 hourly till fever is above 100F.
Do tepid sponging to bring fever down.
Give plenty of fluids and soft bland diet to maintain nutrition and hydration.
2 to 3 times over rashes and if there is itching you can give benadryl
as per dosage after consulting your doctor.
Wishing your child good health.