I wonder.... I don't recall if you were tested for West Nile Virus?

I think you can look up where you live for stats on this. Our area was at one time having high infection rates, so high that our city started treating the storm drains with a chemical to kill mosquitos.
They dumped the stuff in and spray painted the grill of the drain each spring.

In the past I met a woman not far from me who became seriously disabled from West Nile. She could no longer work, and her memory was impaired from the encephalitis it caused. So while the CDC says that reaction is rare, it might not be so rare after all.
Most of our crows died from this. And today, we rarely see crows, at all. They used to be common here. So if you see an obvious shift in certain bird populations, you might look into West Nile.

But certainly-- your daughter being ill now with similar symptoms is very concerning. I hope you get to the bottom of this soon.