I agree with @picassowary, but I also read this as complicating the virtuousness surrounding motherhood. We put mothers on a moral pedestal for being sacrificial, yadda yadda, but here is a mother violating that expectation of purity, good sense, decorum, and sacrifice. What questions can we now invite?
How vile are mothers on the far right? How tantalizing is the Kool aid on the far right to seduce virtuous mothers into debased insurrection? How troubling is white supremacy that white women participate in it because they are rewarded for being complicit?
The list goes on if you read the inclusion of the word mother as a way to violate the expectations of motherhood more than read it as a pull for sympathy.