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Why isn't this case listed in the unidentified thread? Mods?
I am not a Websleuths Moderator, but to answer your question, there is no reason why she should not be listed there as well as in the Cold Case section. I am not certain when the unidentified section was started - possibly after the Cold Case section had already been going for a while.
It simply comes down to someone taking an interest in the case and posting it there. Moderators sometimes start threads and post messages, but the bulk of postings are from persons like yourself - they take an interest, take the time, and type it up.
If you decide to start a thread about this little girl on another board, you should include a "Link" to this thread, so that visitors can go here to read other postings on the same case.