These questions have been answered quite a few times but, I will summarize the best I can
-I don't think we know exactly why she began killing. She has a fear of bleach, and apparently those who use it got offed. My reason is Bleach = Hiding dirty little lies. And therefore, she wanted to kill them. She began targeting Grissom when Ernie died, she felt Grissom was the reason for it.. When Ernie did it, so Natalie would stop murdering.
-The spoilers got revealed (I think anyway) from YTDaW. While direct spoilers weren't, the sides were. I think, the reason being that CBS even began releasing such spoilers is because there is more to the episode than the who the killer is, Sara getting kidnapped, and the whole fear of bleach.
But who knows.
-I don't think we know exactly why she began killing. She has a fear of bleach, and apparently those who use it got offed. My reason is Bleach = Hiding dirty little lies. And therefore, she wanted to kill them. She began targeting Grissom when Ernie died, she felt Grissom was the reason for it.. When Ernie did it, so Natalie would stop murdering.
-The spoilers got revealed (I think anyway) from YTDaW. While direct spoilers weren't, the sides were. I think, the reason being that CBS even began releasing such spoilers is because there is more to the episode than the who the killer is, Sara getting kidnapped, and the whole fear of bleach.
But who knows.