This could be really bad. I'll pray that your girl pulls through this.
If she were my hen I'd give her a calcium tablet (human calcium supplement) or even a Tum's tablet (for indigestion/gas) to strengthen her contractions (help her expel anything still inside of her. I'd also give her a 15 or 20 minute warm bath, preferably with Epsom salts if you have them. This will not only to cleanse those feathers, but also to help her if she's egg bound or still attempting to push the rest of the stuff out. You'll need to separate her from the flock for a day or two as chickens will continue to peck at anyone that's 'under the weather' and them pecking around her vent is bound to cause injury or even death. A wire dog crate placed in the coop will help her maintain her place in the pecking order while still protecting her from the flock.
Check her nesting box, you're looking for either a rubbery film (indicating a shell-less egg) or any broken shell fragments. It's not uncommon for a hen that's having a laying problem to have two eggs battling to find their way out, one of which is often without a shell. If you don't find the rubbery film (shell less egg) then you need to be concerned about a broken egg inside of her.
Again, if she were my girl, and if I couldn't take her to the vet, I'd lube up my gloved hand and insert a finger into her vent about a half inch to an inch, gently feeling for broken shell inside of her; the shell can slice her wide open inside. If you find broken shell in there, you're going to need to decide how to best break that down in such a way as to not cut her, and get it out of her.
In either case, I'd put her on antibiotics, sooner rather than later in an effort to stave off infection, egg yolk peritonitis, salpingitis. Reproductive infections are incredibly difficult to remedy, so I'd not wait to start antibiotics.