In my expereince, women are not as fond of humiliation (especially public humilation) as submissive men are. Not to say that no women enjoy it, some certainly do (and good for them) but most submissive women like their Dominant Male to be just that; Dominant and masculine.
I am not advocating communicating via grunts and unrelenting agression either, just caring mixed with strictness. Stern and loving.
Tasks are excellent and can be as simple as the same thing done at the same time every day. Private tasks that make them think of their Dom constantly. Tasks that require planning or memory work well for women. Again, I'm generalizing, so any subbie women on this forum may feel free to add to this or clarify.
Does your sub usually wear Thong panties? Go with her and make her buy some plain white granny panties. (Also, Wearing thongs is a great task for women who do NOT usually wear them!!) Tell her to wear them every Monday (or the 6th of every month, or whatever). Make up the rules, make sure she knows the rules - then stick to them. She didn't wear her special panties this Monday? That calls for a disicipline. (milder at first, then progressivly more stern with repeted offenses.) Follow up and make sure they're worn next monday. No wiggle room or excuses allowed. What Disciplines? Make her come up with those. Don't hesitate to discard the ones you don't like. Have her come up with more.
She should also have a loyalty oath, pledge or mantra that she recites at regular intervals, such as every night before bed, for example. (Or every morning before she can have her coffee or tea) You can google this mantra, write one, or make her write her own.
Listen to what she says when you just talk, use that in assigning her tasks.
It's not all Jedi mind tricks, a subbie doing the vacuuming nude while wearing an insertable dildo or butt plug is a VERY good way to stay at the forefront of her mind, too.
And it might make the UPS guy's day