Before you do anything you should read this.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1166494/
Next you need to get a strong magnifying glass and check for cracks going up the beak towards her head. If there are noticable cracks then you may have problems.
You can file her beak very carefully a bit at a time to help reshape it.
It took me two months to reshape a rescue hens beak here so that it looked something like normal.
The first thing to do is smooth the ragged edges. This will help prevent crack propogation when she pecks a hard surface,
Then it's every couple of days work on the protruding piece aiming to get a uniform roundish end. It takes a long time. Her beak will grow and if she doesn't damage it further, it will repair.