As you feed off of the lack of self esteem there is another important aspect that you need to remember, have her not be content with herself. This can be hard though. You don't want to push her too far or she might realize, and the trick is to not let her know. When she thinks highly of herself use that as a way to get her too proud, focusing always on herself and how much better her looks or manners are than those around her. But when she thinks lowly of herself get her to put herself down. This degrading concept is one that is very important to install. Don't let her think she is as good as the rest of them, let her wallow in it. Have her count the few mistakes rather than look to the positives. Make her think that these negatives are the most important and have her constantly dwelling on them, reminding her of what she is not,
Affectionately yours
COILROPE