I really don't want to point this out as it's pretty late to notice and she's in my top four, but Sally wasn't saved on the previous Day.
http://www.gamefaqs.com/boards/8-gamefaqs-contests/60149235
Karo and I save her on the first page, but on the first update (second page) she's removed from the list of Unsafe characters in spite of needing one more save.
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"We like to think the past doesn't have any effect on us, but ignorance of the past can be as dangerous as a ticking bomb."