All good advice. The part I highlighted is more important than mere words imply because it is implicit in her submission that she is valued for what she can do. Her value, her self esteem, increases thereby.
That's touchy... because it is really about the relationship between you and not you or her. Some subs may want to be the center of attention, but in the long run they become disappointed and look for more.5) It's actually all about her in many ways. This doesn't mean topping from below, it means recognizing her needs and meeting those needs.
You, as the dominant, provide that "more" by being dominant, in control, and demanding that your needs and pleasure are served.
What does she get out of it you may ask? Got a hobby? How much attention and care do you lavish on your equipment? Do that much for your sub and she'll get plenty out of it... and yet, it will still be all about your needs, your pleasure.