I think that is a different Heather Heyer. Sometimes even with an unusual name there can be more than one.

That said I don't believe Heather Heyer was killed in that traffic accident either. I see no evidence of her in the crowd scenes beforehand and no evidence of an injury in the intersection (from viewing many videos and pics). Not even sure she's a real person. Like a spy she may have been set up well in advance with this persona. Very limited social media for a woman that young... Mainly glamour shots on FB.

They plan these things far in advance and they're very well funded.