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When last seen, no. The Matrix's footage of her death had been faked by the Valeyard.

(A Big Finish Audio entitled Peri and the Piscon Paradox states that the Doctor's trial, his being taken out of time etc. Had created temporal anomalies which resulted in no fewer than five different versions of Peri existing in the same universe, and that one of them had indeed died during the events of "Mindwarp").