Hi Stephanie welcome to the forum. So others don't have to ask I can see in your profile you have a
1999 Discovery by Fleetwood 40 ft Diesel, two slides
As far as the issues at hand can you take a moment and describe what you found about the GFCI being installed backwards? Was the white wire attached to the hot (brass) screw? Or were the line and load connections reversed? And more importantly has the miswire been corrected?
As far as nothing working I would suggest do again what you did to get it all working again. Make sure both AC units are set to off. Then unplug the shore power and do not start the generator. Then flip all the breakers off. Push all breakers in the off direction to make sure they are actually off.
Now plug in shore power and then flip on the main breaker. Select another breaker and flip it on and verify that whatever is in the circuit actually turns on or works again. Repeat until all the breakers are back on.
If anything is still not working let us know and we can help you figure out what is wrong.
Also as aside for the future. Your daughter rapidly flipping the AC's off and on possible caused a rotor lock. If it happens again just turn off the affected AC and wait 10 minutes for it's internal pressures to stabilize and then turn the AC back on. Providing a breaker didn't trip the AC should be able to recover.