Based on a couple of similar experiences over the years, I would be more concerned with other chickens pecking at the pin feathers, resulting in bleeding, which quickly leads to a larger problem. It may be best to isolate the late molting bird until she feathers fully.
I had to isolate her. A few of the Alfa's were running off and she was not getting food and water at will. I wired off the underside o f the poop board. Food, water, fresh shavings and heat lamp until freeze warning is over.