Toady at lunch her friend pointed at me? What was that?

Girls are silly. It could have been just nothing, or that they were talking about you and just pointed at you without really thinking. The fact that you guys used to be much closer could mean a lot of things. It could mean that (as teen girls often do) she's simply changed. She could have changed her group of friends and/or will only talk to them and hang out with them so she fits in. Her friends may make fun of you and because of this she will speak to you less. Or it could mean that she's developed a crush on you and is incredibly shy around you now... if this is the case, all her friends probably know and that may be why they look at you and smile.