No discharge from the eyes or beak? Hopefully it may just be different feed, bedding or something new at your place that she isn't used to.
You do have her quarantined, right?
I would watch and make sure no other symptoms develop, but sometimes sneezing is just sneezing.
Oh, sorry, almost forgot to answer your question, no chickens don't get "colds"-it's usually some kind of respiratory infection if it has reached the goopy eyes, beak discharge stage.
Then for right now, I would assume it's an environmental/feed change.
Good for you for isolating her!
Just watch her and hopefully she'll stop the sneezing once she's outside in the fresh air.
Hope it goes well for you!