how does she knows me??

Today in school....
as usual me , sharon( a girl frm 2 zam),
Darweena(pn.pushpa's daughter), saigai thri( pn nirmala's niece)
were sitting down at the grass area after school...
suddenly...
PN NIRMALA join our conversation...

Sai: Darweena do you know the boy in your class wearing specs?
Darweena: oh..you mean the ......(forgotten his name).....ya..why?
Pn.Nirmala: oh that boy, he use to be a good boy last year...but now...
Darweena: ya teacher...he likes to pour water on the floor...
2 minutes later...
Pn Nirmala: Sharon...what class are you from?
Sharon: 2 zamrud
Pn Nirmala: all the 'ZAMRUDIANS'
Sai: the weather todady is quite cozy
Sharon: ya...dun really sweat a lot today..
Pn Nirmala: afternoon is so hot especially when "they all" don't want to line up quickly...
Darweena:ya...especially the girls..taking their own sweet time to walk..
SUDDENLY!!!
Pn Nirmala :Jo Yee where do you leave??(OMG...i am covering my name tag all the while..but she still know my name )
Jo Yee:erm(somewhere but i'm not gonna mention here)
Pn Nirmala: Sharon where do you leave?
Sharon :erm.......(sumwhere on earth)

There's still more but i had forgotten....
anyways....
i'm just shock that we've been talking with Pn Nirmala for more then 15 minutes.....
it's like the worst miracle happen to me..
HAHA....