I remember this movie where there is this girl who has long red hair and she lives with her mom and grandpa and she want to trade places with the rich popular girl. And they do switch.. I can't remember the name of the movie can anyone help me??

I know what movie you're talking about, it's called The parent trap, with lindsay lohnan, and they have an older version too!

No, Its not Parent Trap... its THE GREAT MOM SWAP! Very good movie! :)