I bought a horse in KY and I am going to be trailering her to MD on the 10th of November. I have a trailer that looks like this

My concern is, the trip will be more than 14 hours (we'll stop every 4 hours to give her water and a break from being in the trailer if we can find decent places to stop). The slats on the side of the trailer are open as you can see, so there will be wind blowing in on her.
Should we try to build some sort of windows/cover over the slats to keep the wind out? I don't want her to get ill after so many hours in a windy trailer.
Advice is very much appreciated.