Looks to me that the way it works is that if you encouraged her consistently one way or the other, she'll follow your instructions in that same direction during the finale. If you gave her mixed messages, she'll do the opposite of what you say during the finale. I encouraged her twice to the light and once to the dark, and when I told her to release the souls, she absorbed them. When I reloaded and told her to absorb them, she released them. I "think" that no matter how you encouraged her, you can force the desired outcome at the end.