The flashback picks up again from when Su-yeon, after being comforted by her mother, wakes up and opens the wardrobe door, finding her mother who committed suicide.
The flashback picks up again from when Su-yeon wakes up, finding her mother. This was after being comforted by her mother. This mother committed suicide. The flashback opens the wardrobe door. The flashback was finding her mother. This mother committed suicide.