I've dealt with cracked beaks. Put a little neosporin on it to prevent infection.
The main issue you might have to deal with is her ability to pick up feed and eat it.
It would be best to put her in a cage. Then put her feed in a deep bowl and add water to make a watery gruel for her to eat, ensure the water is lukewarm, not cold. You dont want her pecking at feed on a hard surface, it can further injure her and cause pain.
It will heal in about 3-4 weeks depending on the severity of the injury.
Ensure her cage is cleaned as needed. You'll have to add water to the gruel later in the day as the feed absorbs the water and the water is her sole source of water to drink.
Make a new batch of watery gruel every other day.
After 10 days, remove the bowl of gruel and put few grains of scratch on the bottom of the cage and see if she can pick them up with her beak. If she cant pick up the grains and swallow them, place the gruel back in the cage for another 10 days. Then repeat putting a few scratch grains on the bottom of the cage and see if she can pick them up normally and eat them. When she picks up feed normally, the beak has healed or a new one has grown under the damaged beak and then she can be returned to the flock.
I dont recommend Blu-Kote for cracked beaks because it contains alcohol. There are many nerve endings in a chickens beak, alcohol would cause burning sensations.