I don't understand

You know what I don't understand? I don't understand how my boss can be so stupid. I gave my 2 weeks notice and she thinks I am going to be working until the 18th of the month when my 2 weeks would be up on the 13th. I just don't get her she really is pissing me off! Oh well I wont have to deal with her shit or anyone else in that company anymore after the 13th. THANK GOD!!!