Tire her out with walks and playtime. Make sure she has toys/chewy things all the time. Introduce her to the other campers (at a distance, from the road). Keep reassuring her that everything is okay, you’re safe, she’s being a “good girl”. Frankly, camping with a dog can be exhausting until they get used to being in a new place and protecting you from new dangers. Our Great Pyrenees was born to bark, and it’s a struggle to keep her from barking, as it’s her inbred way of protecting us. Be assured, with the windows closed, Ollie’s are almost sound proof. Tie-outs are a struggle, because you can’t tie her out and ignore her, she still requires constant feedback that she doesn’t need to bark.
good luck, she’ll come around and embrace camping too!