Le Regard dans le miroir S01 E04 Episode 4

Dora Stern, an American photographer living in Paris, wakes up from the same nightmare over and over again. In a small antique store she finds a collage with fearful eyes that haunt her. At home she removes the layers of the collage until she can see the original photo showing a young woman in fear who looks exactly like Dora Stern. But who is this woman?