The color of the gun is irrelevant, unless she just happens to have a passion for pink of course.
She needs to take a good basic pistol class first. Then she needs to find someone (possibly the instructor) to help her find a gun that really fits her hand, lifestyle and choice of carry method. The latter will change as time goes by and she discovers what she really likes... but you have to start somewhere.
A great place to start after the class is a good gun club or store with a range that rents guns. She should handle and shoot as many different guns as possible before she starts to shop for one. It will cut down on the time and frustration of the whole effort.
Pink is nice for some gals, but my big, black XD .45 is mighty beautiful to me.