L2 Girl

the strange girl from L2 who sings to herself (heads, shoulders,knees and toes.. while in class!!!!! whilst doing the actions... before class begun and we all in little groups talking...) and who also sits in the cafeteria when karaoke is on and sings along... and doing the actions... by herself! ( eg 'Stop' by the Spice Girls) and who also has to have an answer to everything, or at least has to have a say.. and leaves when she said a complete wrong answer....