Poor thing - it had to be devastating for her to watch her babies get killed.
You are good and brave to be helping her - maggots are not for the faint of heart even though they won't hurt us!
Post pics of her and her wounds if you can - may help in getting the info you need.
Quiet, warm, very comfy, stress free place to rest. Sounds like you are already doing.
Fluids. Yogurt. Egg. Sunflower seeds. Whatever she will take that will help strengthen her and increase her interest in the good stuff of life.
Poultry vitamins/electrolytes (e.g. Durvet) in her water for a couple/few days.
If her wounds look as though she should by all rights be in pain, you can crush a baby aspirin (no substitues) into a cup of water. Mix fresh batch no less than daily. Two or three days of this should be enough but this can be reevaluated a little down the line.
I would be inclined to not mix the vitamins and aspirin in the same water, though I don't know that it would necessarily be a problem. Maybe one in the a.m. and the other in the afternoon/eve. You can also cut up little pieces of berries and grapes, submerge in the aspirin water, remove and then feed them to her. She'll get some hydration from the fruit and a tad bit of aspirin water.
Topical neosporin - good. If she has any deeper wounds she may need oral or injectible antibiotic but if not, neosporin may do the trick.
It's true that maggots are only after the bad tissue. They will need to leave sometime though - not sure best moment for their exit!When I brought an injured feral cat full of maggots to the vet he sprayed water on the areas till they washed out the bugs. If you do this at some point, you may want to do so in a contained area like a bathtub, if the whole project doesn't stress her unduly. Have the hen on something with very good footing. You could give her a drop or two of Rescue Remedy mixed with water in advance of this project. It has a calming effect.
If she was attacked several days ago at this point and does not appear unduly ill, she probably has a very good chance.
Please keep us posted
JJ
Karen, yes, chickens can have stitches.