I have heard of blowing the eggs (you put a small hole in each end, break the yolk with a needle and blow like mad to empty the egg) and filling it with mustard, or chilli paste, or other noxious tasting liquid. Seal it with wax and put it in an empty nest. She really won't like it. Either that or invest in/build a nesting box that rolls the eggs away underneath her into a tray before she can get them.
I have tried everything including giving her rotten eggs from the incubator that did not develop much she still ate all of them and then her egg. I even saved all the eggs in the sun for two weeks before giving them to her.
I tried this twice....didn't do a darn thing.
She is dinner which is a shame because she is a dark egg Welsummer hen.