Jennifer returns while in the episode "Lauren" (season six) to assist the team in finding SSA Emily Prentiss (Paget Brewster). Jennifer returns to be a series normal from the season 7 premiere as a legit profiler and admits to supporting fake Prentiss' Dying, Substantially to dismay of her colleagues. From http://romanempirereignofbloodse70119.blog2learn.com/31792583/seasons-1-9-blue-bloods-no-further-a-mystery