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 have six cats that do a nice job on the rodents but Millie was even better. She would lie under the coops for hours waiting on the next unlucky victim. But as I noted in my earlier post, Millie would eat kittens too so I didn't get cats until after her passing.
My teenage boy remedy for getting rid of a couple large Norway rat infestations was to pour gasoline at the entrance of their holes. I would wait a few minutes and then throw a match in one of the holes. By then, the gas fumes had built up in their underground tunnels and would ignite sending...
The nice thing about bantams is they have small poops. I only have to clean my 8' x 8' bantam coop out about one time per year as I keep the litter about 6 inches deep and dry. There is not really much odor to speak of, even after a year.