In severe cases de beaking (or culling if you don't want to put your bird through a life without a beak) may be necessary, but you also may want to separate her from the others, cause chicken see chicken do. if the other chickens catch on to her eating the eggs they may follow suit, which is the...
You may want to put something in her nest box that looks like an egg but is hard, like a golf ball or porcelain egg. Then, when she pecks it the surface will be hard. TAKE ALL THE EGGS as soon as possible, and hopefully she'll try to peck at the balls or porcelain egg and learn better. Either...