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Perhaps ask one of the other co-workers to discreetly enquire as to why?  If there is a misunderstanding, it can be cleared up.  If it is some irrational inexplicable hatred of you because you looked at her funny one day and you can't even remember it, well there you go.  Nothing you can do about people like that.  It's best to ignore them and just concentrate on the genuinely nice people out there.  It's her loss, not yours.