Let her speak, walk left one and then back to find her dead. Don't approach her body, go to the left three times and grab the rose. Go back and place it on her body, then walk left and back again. Approach her body. Make sure not to walk up to her until you've placed it AND walked away then back.
This game is CRIMINALLY underrated. I realized there weren't any videos about it on youtube and posted my own. It's a recording of the final ending so there will be spoilers. I can't wait for the bigger project.
