Here, I'll try to explain what's happening so you can help me get that point across, even though it IS supposed to be a "what's going on here" moment that you figure out as you read. Actually, it's modeled after one of my favorite books. After a scene in "Matched" by Ally Condie.
The Retopia General is a potential oligarchy attempting to overtake the world after it has descended into virtually The Purge. All that's left of humankind is gathered before them to protest, hence the woman and her child. They are prone to violent outbreaks because of being raised in a lawless and anything-goes environment. Fighting breaks out because of their heightened emotions and predescribed violent tendencies.
Eventually, the riot gets out of hand, with one of the mob brandishing a gun. They pull the trigger randomly, perhaps even accidentally, and it hits the mother of the child.
Though I think the idea of it being from her perspective is intriguing.