Help me find a bush for my Dove!

I have a little dove who was a rescue from the wild. I live in Nevada, and near me there are no trees for her to play in. I have wooden perches and a big cage, but I'd like to get her a little tree or bush! It would mostlikely be kept inside, and can't have a giant pot if possible. Pigeon/dove droppings can be great fertilizer, so I figured it could be a symbiotic relationship! Any advice?