Who says she has to walk it at all?
The urge to “always obey all the time” should come from inside. Even if someone outside is constantly reinforcing it, there should be a wellspring within that sustains such a level of submission. In my experience, if obedience is her peace and purpose, she’ll be uncomfortable thinking in terms of “if you want”… what she really wants, after all, is whatever he wants. Ultimately, she’ll narrow everything down to “if you need”, a far more manageable cognitive load to balance, and one that’s eased by the concept of Protecting The Property. (In essence: when it comes to preserving her owner’s investment in her, “no” can be the most obedient thing a girl can say.)
And if determined and exacting obedience doesn’t come naturally to her…? Perhaps she should stop struggling to provide it. Sure, I’m an aggressive advocate of obedience, but kink is a lot bigger than me… there’s room in the world for girls who prefer keeping one hand on a pressure valve while someone else is cranking up the heat. And if someone tells her she can’t be what she is, she should tell them to fuck right off and go find a partner who likes the way she turns that knob.