Then I better do ala James Bond, get to the mall, keep her on the phone ask her what she's wearing and where she at, I zoom in from distance and then I take a decision.
I'm very disliked lately.
I think your solution is to completely turn the tables on the situation. If it's plausible that you could have a case of misidentification, then so can she (he?). Get a friend of yours to meet her, pretending to be the person who she called.
If she's hot and not carrying any knives, you can intervene from a distance. Otherwise, your friend's role will be to make her believe that
she didn't know the person she was talking to on the phone . He could keep playing up that he knows her, etc., and she then can wig out from her obvious mistake. Your friend can even carry your mobile to make it seem official.