"Tendo Kasumi desu. ?"  She said.
     Japanese?  I don't know Japanese!!  Wait, she did say Tendo
Kasumi...  Can she be?  "Err...  Jang Choe desu..."  I blurted out.  "Uhhh...
Oh genki desu ka?"
     "Genki desu, koko wa doko da?"
<<<<<<<<<<<<<<<

Couple of quibbles:

One, I doubt you intended to put a question mark after she states her
name.

Second, it seems unlikely that she would switch politeness levels (to use
Mangajin's terminology) in one sentence.  I imagine her response would
be more appropriately rendered as "Genki desu.  Koko wa doko desu
ka?" 

tom