S4·E16 Forget Me Not

Rachel recieves a blast from the bast. While watching an old home-video Kat notices a little girl in the video that had never been there before. It turns out the little girl is named Paige, Rachels child she gave up when she was 19. Paige died some years later and is now out for revenge on Rachel, who she blames Rachel for not being there to save her. Can Nick prevent Paige from hurting Kat ? Can Rachel re-connect with Kat after this discovery, that Kat has a sister ?