This tragic story demonstrates why you must not be satisfied with merely completing the minimum statutory training requirements for concealed carry.
You must continue your training. Get as much training as you can.
I offer a free basic handgun and concealed carry class (http://guntrust.org), together with my free estate planning seminar.
Among the many topics covered: why a purse (even one designed for concealed carry) is a poor method for carrying concealed.
I think this tragic case also serves as an argument for open carry, in several respects (convenience for the carrier, accountability to neighbors for safety, frequency of carry, etc.).