My daughter gets this way with a mild-moderate allergic reaction. We will give her an antihistamine (Zyrtec) when she is like that. We also now have her on a daily dose of Claritin Reditabs to help avoid the reactions.
One other thing that makes me wonder though besides the runny nose- could the red cheeks and feverish look be from being in the pool and not showering afterwards and also possibly be dehydrated with as hot as it was those days?
I hope that she is better now! Many blessings to you and yours!