She’s been molting for a few weeks now and we’
She’s been molting for about 3 weeks now and we’re expecting temps in the 20’s for the next 10 days or so hence my concern
How naked is she? I've seen hens that looked bare or like a pincushion (pinfeathers all over), and others that always had enough feathers because they molted a few at a time.
Given what you say of the temperatures, if she's looking bare, yes it might be good to provide a little heat at night until the cold spell is past, or until she regrows a good amount of feathers.