How to introduce more silkies to my one silkie survivor

I had two silkie hens a couple of weeks ago. One afternoon I let them free range and a feral cat got one of my girls. Well, we caught the cat in a trap the very next day. Needless to say, there wont be any more problems from it!
So now I am down to just one silkie. I had brought her in the house for several nights, for two purposes, one being that we decided to expand the coop to accomodate more silkies, and two, I just felt like she was lonely out there after losing her friend. We got the coop finished 2 nights ago, and I put her back out there. She doesnt leave the coop very much, but the weather has been nasty, so not sure if its just that, or if she is still freaked out about losing her buddy.
SO now, I want to bring more silkies in, but am curious as how to do this the right way. I would like to add 2-3 more hens, and possibly a rooster.
I have read that to introduce more chickens to the existing flock(which in my case, is just one) that you should put them in a cage inside the run. But what about at night? The coop is too small to put a cage inside it. What is the best way to do this?
Perhaps I should take my existing girl out and keep her in the house for a day or two, and then introduce her to them? Help!