Do you have a link for that? I’ve heard that several times but haven’t been able to find anything to substantiate the claim.
Here is a link with the research including a video of her mother saying what the coroner determined in an interview. The picture used by the media is also very old and she looked nothing like that at the time of the incident. This is not news the media will ever report on.
http://www.thetreeofliberty.com/vb/showthread.php?236947-Heather-Heyer-Died-of-a-Heart-Attack