@Gargron
In case you're not open to unsolicited advice from strangers:
That sucks :/

In case you are:
what's worked for me has been starting up fireworks on youtube like six hours in advance on very low volume. Slowly increasing the volume whenever she's relaxed again.

We've done this since we got her so it's never been a problem though, by the time midnight hits she barely wakes up. Maybe it's less helpful if they're already scared though, I'm not an expert.