Its just going to take time, the feathers will fall out on there own. Pulling them is not a good idea because it can harm her and the base of the feather. I would wait it out, since Pekin don't really fly there isn't a ton of concern. Also in my experience, the flight feathers are the last to go...
What we have is just a small dog house that sits on the edge of our pond, but I live in Texas, so the weather is a lot different. The duck barely if ever go in the houses now, opting to just stay outside.
I am picking up some silver laced Polish in 5 days, but are they APA standard? Are silver and silver laced the same thing? Whenever I google silver Polish I just get pictures of the laced ones. I just want to double check before I get these birds, as they are quite expensive and I need to be...