First make sure she likes you, if she calls you everyday and you two hang out she might think of you as a friend and not consider you boyrfriend material. So its best to ask a girl out soon, but not to soon where you fall into the "just a friend" catagory. If she ever refers to you as her "best friend" or "just a friend" then you're pretty much in the friend zone and your chances with dating her are slim. So dont wait to long next time you see ask her, "will you go out with me" plenty of ways to do it. She may be thinking the same about you as well and not have the courage to ask so you never know just ask. Will you go out with me?