My guess would be that she has prolapsed anus. Could of have cut her self near the anus some time during the day or night.Wasn't there last night at all. Came home today an noticed after work
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This thread might help....
http://auscichlids.com/forum/index.php?topic=3105.0
And this one.....
http://www.monsterfishkeepers.com/forums/showthread.php?15715-Cyrtocara-Moorii-with-Prolapsed-Anus