Raise your charisma. 4 charisma gives you even odds of getting successful trainings with even the most headstrong girls, 7 charisma guarantees success. Scolding when it fails can get you a consolation prize.
Use hypnosis and match emotions.
Classes might work if your pimp sucks at training. Items and food, if you really need obedience
now, as opposed to eventually.
Letting her clean the farm, if you're fed up with her and want to focus on other things while she
slowly builds up her obedience.
Well, then she really doesn't need more obedience, does she?
You can punish her for more than just not doing her work. Use every excuse you can.
Well, it's kind of a Catch-22 situation, then.