I can tell you my experience that my wife loves the Spyderco dragonfly. It’s her favorite of all knives. It comes in yellow, orange, green, black, purple, and other colors if you can find them. It only weighs 1.2 ounces and will fit in the tiny nonexistent pockets on women’s pants, in the waistband of their skirts, and in those tiny things they call purses.
Another recommendation that I could make for something nonthreatening would be the Spyderco roadie. It comes in about six colors but it is a two handed opening life not quite as useful as a dragonfly.