why does my friend always try to avoid every time i call her or send her msg when i know she is online or when i call her she sends me straight to the voice mail and when she finally answers my msgs i ask her why does she avoids me she said oh i need to talk to u face to face and i said well did i do something wrong , she said i will call u tomorow nd i said ok. i just think she should just be foward with me

You say your friend ALWAYS does this so going by what she says when she sees you face to face is she cool with you or is she getting on you that you did something wrong?

With what you have told us so far I would say (guessing that she is cool with you and not upset) that you should stop asking her if you did something wrong and stop feeling like she is avoiding you.
I can't say what she is doing that she doesn't reply but it could be either
She doesn't like talking on the message and would rather talk in person or
She is doing something like playing online games, looking up things, or talking to people that she can't talk to in person later.
I know when I had message sometimes I would even be cleaning, cooking and doing other things and not even notice that I had an message from someone.