Oh gosh, your poor girl! Fortunately, the break was down low on the beak and only seemed to break off the outer 'shell' of the beak. Still painful for her though, of course! There are nerves in there. When my Kua broke hers, it was a much deeper break closer to her skull and for a while I was really worried.. eating and drinking seemed to hurt her so much! In my case, because it was severe, I'm glad to have gone to the vet as they prescribed metacam, which is a painkiller. Getting it INTO the chicken with an injured beak was another set of problems, but it did help Kua get past those first few super painful days.
It sounds like your little lady is past the worst of the pain, but it will be sore for a while. You might find that she is unusually picky, even with 'favorites'. Just keep after her and as long as she's eating, she should be okay. If you have a postal or kitchen scale you can even weigh her if you are concerned about her dropping weight. When Kua broke hers, she was temporarily not competitive for food, and when I put her back outside she was driven away from the food, so your girl may need some extra care as she learns to adapt and mesh back in with the flock. If you can, put her outside on the warmest foretasted night after she is eating better for you. I find that putting them out on the roost is easier to mix them back in, as they all wake up together and seem to think "oh, maybe I was dreaming that she was gone in the first place!", haha!!
Her beak will grow back to normal within a month or two! It is not high or deep enough to have damaged the tissue that generates the beak's growth.