An excellent training tool is position practice.

First assign visually appealing positions that for her will induce a contemplative mood as well as instill her sense of correct posture.

On her knees sitting back on her haunches, body erect, hands on her thighs, palms up. Or I call call it. Position One. Five minutes to start, more later as she grows stronger. Daily. She should be in this position when stressed or nervous. She should be in this position just before doing tasks for you, or just waiting for you... thinking about the joy her submission brings you.

Position Two transitions nicely from position one. She need only bring her hands up and clasped behind her neck. Displaying herself for you or your guests. Available for inspection and fondling and general play. Her knees are equally wide as position one, or wider if necessary to make her available of checking her readiness for you... for indeed, her anticipation of being used should make her wet. When you add this postion, five minutes at a time.

Position Three transitions from position two, she need only lower her upper body to the bed (or floor) and reach between her knees to clasp her ankles. A form of self bondage.
Clearly, this is a position that allows further and deeper inspections. It is a position in which she knows she is offering herself for your use. It is also a position in which she knows you may play with her ass should you be one who enjoys applying your hand or a paddle, flogger, whip or cane. Or if she deserves a punishment (and you are so inclined,) it is a position in which she must not only offer herself to you, she must maintain her grip on her ankles. Ten minute sets once you add this.

I sometimes let my girl masturbate for me from this position, hand or dildo, because she has done such a good job making herself ready and available for me.

BTW, these are also great training tools for when you are absent, or for an online sub. Just give her specific instructions to chant a mantra or thank you by name, and an image of her to put in her mind, whether it be you in your customary clothing, or holding your crop, or just you "watching" her (my favorite.)