Have searched & couldn't find the actual site, but I did find this, #14 mentions almost everything frm the prev mentioned site but also questions prep H, with a logical reason why not to use it.
Hope this helps to sort your little girl...
Hi have registered to supply the info I located when trying to diagnose one of my own chickens, apparently your little girl is suffering for a prolapse, she has suffered some form of trauma, possibly during laying of a mishapen or larger sized egg. Treatment is fairly easy & vet intervention...