I'm not going to dismiss the possibility that @_LoveThyLondon is not DeeDee on that basis. There has been plenty of speculation that DeeDee was a close friend, but not "girlfriend" the way Crump states the relationship between DeeDee and Trayvon.
But with all the media talk about DeeDee being Trayvon’s girlfriend, this other girl’s reference to “Trayvon’s girlfriend” must be a reference to “DeeDee” - the person who was supposedly on the phone with Trayvon when the confrontation began. So this girl is saying she’s not that person.
Unless this girl knows who “DeeDee” is and that she was not Trayvon’s girlfriend and was sympathizing with somebody who really was TM’s girlfriend.
Did TM tweet about somebody he called his GF?