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I have had a broody that wouldnt take any eggs but her own. I solved it by taking her off the nest and rearranging the eggs and putting her back on them 10 minutes later. In the 10 minutes she seemed to forget which eggs were hers and which are new. Dont do this if the eggs under her are already developing.
If you have had her sitting on the eggs for a day or more she may simply not recognize them as hers and refuse. If she has been sitting on them for a week or more she may recognize that they are behind in development and refuse. Are you sure the eggs you gave her are viable? Hens are amazingly astute at knowing whether an egg is even going to develop.