Seemingly impossible, and the antis are jumping all over this tragedy.
Truth is sometimes stranger than reality... the odds against this are astronomical for the perfect storm to align (irresponsible gun owner, toddler in reach of loaded gun, able to operate it, and actually lethally shoot the mom and have her die)! But apparently confirmed by the store's video surveillance that is exactly what happened.
The logistics seem improbable. Must have been something with a hair trigger and safety off, perhaps a 1911? Or a striker fired gun? No holster?
Lessons learned:
1. Serves as a reminder to keep loaded guns out of reach of toddlers.
2. On body carry and positive control beats off body carry. Purse carry is simply stupid - as purses are generally targets of theft and a purse gun just arms the thief.
3. Pay attention to your kid in the cart. How long was this child basically ignored to be able to accomplish this? Negligent parenting all around.
A reminder that life is random and fragile no matter the steps you take... that woman probably drove with caution to the store (driving being the most dangerous daily activity), and carried a gun to protect her family and herself, but a foolish/cheap/irresponsible decision on manner of carry cost her her life and a scarred mother-less child. Very sad indeed.