What should I do with an injured pigeon?

Today I went to the ranch where I board my horse, which is miles of fields and one parking lot. There are pigeons, cats, ground squirrels, raccoons, tarantulas, snakes, and possums that reside there. There are also birds of prey. When I got to the ranch there was a pigeon sitting on the ground near the door of an open chicken run (there is also a rooster that was abandoned at the ranch and adopted the boarders, who built a coop and run for him). She could not walk and stumbled into the run, where it was too enclosed and too surrounded by people for the hawk to venture in. So the hawk never finished her off, and now I have a pigeon that cannot walk and can fly only a few feet with a bunch of feathers ripped off her back. I'm not sure what I should do with her. I feel somewhat obliged to take her in, give her some electrolytes and shelter, and just have her comfortable until she heals. But should I just let nature take its course and have her starve or get picked off by a raccoon? I have chickens that I raised from chicks so I know a little about treating wounds on birds. So pigeon experts, any advice?

Right now she is in an enclosed area in the chicken run with some cracked corn and water with stones in it to keep her from drowning in it. But it's a chain-link run, so a raccoon could easily nab her and take a bite.