Sudden unexplained unfriending on facebook?

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she probably deactivated her account...there will be no trace of her, so it will appear that she deleted you and blocked you....way to find out is make a new fb page and search for her name..but that isn't always fool proof because some people take their name out of the search as well. you could also try to find a mutual friend you to shared, and see if she is still on their friend list..if not, it's almost guaranteed she deleted her fb.