Ok as corny as it may sound... if what she really want is the pain and humiliation but you need some context to do it, i would suggest giving her tasks, say during the day or week that you know she can't or will have a hard time doing. Then use the pain, humiliation, spanking etc as her punishemtns... if what she wants is punishments, well then.. have at her.

Or, come up with your own reason... one of my favs is having your sub take you birthday spankings... either in public, every time some one mentions it, have them do it to her. or in privet you can deliver them, plus any that you feel that she has coming to her for any embarrassment you had during the day.

Just a few suggestions.