If you have photos of the poor thing we will be happy to take a look
But, in a nutshell, yes they can molt this time of year. Look closely at her for signs of new growth (pin feathers) coming in.
Most chickens go through an "adult molt" around the age of 16-18months old, but they can really molt at just about anytime of the year.
We do tend to feel badly for them, but it's hard on them if they go from a warm house to a cold coop/run. Sometimes it's best to leave them be providing that they have appropriate shelter can get inside the coop away from drafts and wind, have some deep bedding to snuggle into if need be. Blocking the wind in the run can help as well.
I've had one completely naked in the dead of winter - she looked like I could just pop her right in the oven she was so bare. She hung out inside most days, but would venture out on cold sunny days and sun herself. I made sure she was eating and drinking (even went inside the coop, sat with her to give her a treat of egg (they are so good when handfed

) and would give her a direct dose of poultry vitamins a couple of times a week. Seemed like she feathered in fairly quickly due to cold weather, but extra protein and vitamins help.