my daughter didnt say hardly a thing until she was almost 3 - I think alot will talk when they get ready.
my little boy did not talk until he was two. we approached his pediatrician about this and he sent us to get a hearing test which turned out normal. finally at age two he began talking. at four now, he is just fine. you may want to see if she has a problem with her hearing which could be making her slow to speak.
Contact your pediatrician about arranging a speech therapy evaluation.