Don't worry, you're not alone. Just about my whole entire flock of chickens, except for maybe a few younger ones, are molting. It's bad; they all look horrible right now, but in a cute way!
And it's been getting in the 20's-30's during the day here, and even lower than that during the night. Poor babies!
But I did put a small lamp out there for them, to help keep their water from freezing and to help give off some heat. For now, they often just huddle together for warmth and their beginning to recover from their molt.
Of course, my chickens that are molting are, for the most part, adults (or older than 1 year). At 9 months, for your chicken, she should be fully feathered if she weren't currently molting, right? I've seen many younger chickens molt during late fall and even into the winter, and they did just fine. As long as she has an enclosed, sheltered coop and other chickens to snuggle next to for warmth during the night, she should be fine and her brand new feathers will start coming in nice and beautifully again for even better warmth.
Good luck!