It will just have to get less sensitive over time. All you can do is be sure she doesn't have to actually peck anything hard, make a mash for her for a couple of days. Do not apply anything with benzocaine in it--that can be fatal to birds. The pain reliever in most triple antibiotics is...
I wouldn't do put anything that aromatic on her beak near her nose. Just dab some neosporin ointment on the tip and it will be okay. I've had two hens do that and it grew back just fine.