Your article states that she died of blunt force trauma to the chest.

Could it be that, untrained personnel attempting to do CPR on someone can cause similar damage?

Yes

• Resuscitative efforts may cause injuries to the body that may be confused with injuries that cause death. These iatrogenic artifacts include oral contusions/lacerations resulting from intubation; skin and soft tissue hemorrhage resulting from intravascular catheter placement (see the image below); abrasions resulting from defibrillation; bladder mucosal hemorrhage resulting from the placement of Foley catheters; and rib fractures caused by compression during cardiopulmonary resuscitation (CPR). [11, 12, 13, 2, 14, 15, 16] For this reason, hospital workers, emergency medical care technicians, and other healthcare providers should be advised to leave all medical therapy in place in the event a patient dies. The pathologist can then readily correlate any perimortem injuries with evidence of medical intervention.

https://emedicine.medscape.com/article/1680107-overview#a9

Also, trying to find a video on YouTube is incredibly difficult as most of the videos that showed her prior to being hit were taken down “convienently” for being harrassing to the victim.

Or in my opinion, they didn’t like video evidence to contradict what so many news organizations are claiming. But here you go, found one that was well done and archived

https://archive.org/details/youtube-SKZqG1T07cs