I am not a lady so hope you do not mind me inserting my 2 cents worth. Have you, she considered a small 5 shot revolver like the Smith and Wesson 642? Small, light weight and easy to conceal with no external hammer. Both my wife and daughter carry one. If she goes that way tell her to be sure and get it with out the internal lock. They come both ways now.
By faith Noah,being warned of God of things not seen as yet, moved with fear,prepared an ark to the saving of his house;by the which he condemned the world,and became heir of the righteousness which is by faith Heb.11:7