Chick that fell is limp... labored breathing and beak is turning purple.. what do I do?

[Bella the Chicken Lover]

Hi, I ordered some chicks and just got them shipped in today, and apparently one got dropped from a couple feet off the ground. It went completely limp, won't open its eyes, and has been breathing very heavily for the past couple hours. Its beak is getting progressively more and more purple.. What can I do to help her??