Similar situation here. Always a risk of course, but freedom always does! Cats are not generally a problem, hens are a bit big for them! Strange dogs (and foxes etc.,) can be a threat of course - foxes are the main worry, they act first and the chickens generally dont make it! All you can do is...
This happens frequently unfortunately, especially rescue chooks. Anyway, have done just as you have quite a few times, sometimes it works, sometimes not, but its worth a go. Re pooping - Last success I had Prep H, had to keep pushing it back in few times every day for ages. Then tried "people"...
Hi, done this quite a few times, sometimes it works, sometimes it does not. However its worth a go - Just dont overdo the time "upside" down, she needs to breathe. Gets rid of all the muck inside. Found that sugar/water/SMALL dissolved aspirin amount helps. She wont be hurt, just a little...
Had similar problem with 1 of my rescues. Did what you did, Prep H and replaced - then (in desperation) tried a human pantie liner taped each end to chicken (extra sticky tape!) which left a small gap for any poop - which was left on the pad sometimes anyway. This took a LONG time putting back...