Friend Question??

i have this friend(really a real friend) and she never smiles she has no emotion what so ever.isnt somthing wrong with that??she never talks to anyone but her friends.you can make her laugh but never talk.Ive been her friend for 1 and 4 quaters(in school)and ive heard crap like she hasnt talked since her 2 best friends moved away from school and that was like a couple years ago.shes really shy i mean really shy .ive beeen there for (you know) and ive talked to everyone and im friends with alomost evryone.Im not trying to be mean but its just very odd.Why do You think she does this cus i have no clue and dont harr me becasue im talking about my friend i just wanna know why she never talks i would die without friends i will probaly die because im on spring break now just give me a frickin answer as to why she never talks!!!!