Most running shoes are fitted to the sizes. For most cases say a shitlady like yourself knows her size they may come a bit snug in some models but they should relatively fit you. It's when measuring say a hog and her cloven hooves that may be wider, she may be referred to a men's size since a normal width for women are a B, then onto a D, which is a men's normal. Then what follows would be 2E and 4E after that. After 2E the design and ergonomics of a shoe sort of goes out the window, and may be suggested to get a wide shoe with insoles if support is needed.... And most of the time... It's needed.