Thank you for your query on Healthcare Magic.
Your child seems to have gastroenteritis
due to some contamination most probably due to contamination by keeping hands in to mouth.
I advise you to give sips of oral rehydration solutions like Pedialyte
to prevent dehydration
Monitor her hydration by activity and urine output.
Probiotics like lactobacillus
or saccharomyces and zinc supplementation can be give after the consultation of the Pediatrician
The fussiness was due to cold with running nose.
For cold you can give oral antihistamine in prescribed dosage and if there is nose block, put nasal saline drops one or two and clear the nostrils.
Consult your Pediatrician for further advise.
Hope I have answered your query.