why not take her out of the nest box and close it up for the day or put her where she cannot get to it. You can search on here for how to break a broody hen. Also check her really well for mites or lice. THey can get that easily when broody.
sharon
I imagine if it has been a little over a month the eggs would be rotten? Can you candle them to see? Does she have any other symptom than a pale comb and warm?