She could not be eating as much just because she's new, and has to adjust to her new home. Do you know what the shelter was feeding her? Are you feeding her the same brand of pellets that they were? Because if she's not use to that brand of pellets, or to having veggies, that could be why she's not eating them. Whenever I offer my rabbits something new that they've never had before, they almost never eat it right away because they don't know if it's safe to eat or not. Usually they'll eat a little of it, then after awhile once they figure out it tastes good and isn't going to hurt them, they'll start eating it more.
24 hours of not eating anything at all means that she also wouldn't be eating hay either. If she eats hay, that counts as eating. Hay is actually a really important part of their diet and they should eat more hay then anything else. And keep an eye on her bathroom habits, because if she's not eating and not pooping, then that is usually when you have a problem. If she's still going to the bathroom normally, then I wouldn't worry too much yet.
Just keep an eye on her, and make sure she eats something, even if it is just hay. Eventually as she gets more comfortable she should start to eat more of her other foods.
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