"Hello Miss! My names Keitaro and I'm the new Sheriff in town."
Motoko: Keitaro...what happened to you
Keitaro: (A mad glint in his eye) "Turns out, mess with someone's head enough, you can turn a kindly landlord into an all powerful blade wielding bastard."
<a href='http://safebooru.org/index.php?page=post&s=view&id=418874' target='_blank' rel='nofollow'>A link to the pic just in case this doesn't work</a>
One has to consider in canon when shown she is not fully grown since she is so young. Also, if comparing her to Negima characters, one has to take into account 2/3rds that class really do not look like a typical Jr. High or Middle School student. Take Mana as merely one example.