I was thinking about the head girls and how they might actually be organized. There is an entire page devoted to them on the main site, but other then that nothing more is known about them. After reading the page on the head girls I got a bit of clearer understanding, and this is what I came up with.
Head girls - The head girls live with in the top levels of the dorm towers, and away from the normal student dorms that have been around for ten years now. Though there are only five to six head girls at a time, each head girl is responsible for a specific group of students. These students are normally from one of the student dorms the head girl has been assigned to oversee. Though selected by the headmasters the head girls report to the director of security.
Demerits - Head girls are responsible for handling the punishment of any student that has demerits with in their assigned dorm. Though a prefect might give a head girl a demerit for a student under another head girls watch. Demerits that have been given to a head girl for a student in another dorm are to be redirected to the proper head girl. Serious violations of the rules such as destruction of property, or harm to other students should be reported to the director of security immediately. Head girls are expected to hand out proper punishment for demerits. Failure to do so will cause for appropriate punishment.
Prefects - A Head girl may choose any number of prefects to help her with enforcing the University rules, as well help enforce rules in their assigned dormitory. Prefects report any demerits they have given out directly to the head girls, and any other suspicious activity they might have seen. Prefects are expected to behave themselves or receive punishment from their head girl. Prefects coming under the control of a new head girl are expected to move into the proper dormitory. Failure to discipline their prefects will cause the head girl in charge of the prefect to receive discipline.
Dealing with Visitors - When dealing with guest to the campus, a head girl is all ways expected to be on her best behavior. This includes entertaining the guest if need be, or helping the quest find something that will entertain them. For this reason head girls are given copies of a students schedule that fall under their dorm. They are also responsible for showing a list of all available entertainment that their dorm has. Though head girls can ask visitors to help them with a task, they are expected to give proper incentive for the visitor to help them. Failure to be cooperative with quest will result in punishment.
On Campus and during classes - When students are not in their dorms, and wandering around the campus during school hours. It is expected that the head girls enforce the rules on any and all suspected rule breakers. Regardless of where a student falls in overall jurisdiction the rules are to be enforced on any one seen breaking the rules. This can be done through demerits or on the spot punishment.
Well that is all that I have come up with after reading the head girls page, if you wish to read the page yourself you can find at the link given below.
Link to head girl page