Advice on this girl?

I can’t really tell you if she likes you or not, but it sounds like she might be interested. Don’t ask her out in joking manners because you’re going to get an answer that isn’t serious. If you really want to date this girl, meet up with her one on one or just find her when she’s alone without her friends and ask her if she’d like to go on a date with you somewhere. Be completely serious, don’t joke. And just see how things go from there :)

I agree with other answers but being always in the vicinity so it might be difficult for both of you to gauge each other’s feelings.

It may be wise that you stay away from school or wherever you guys meet for couple of days and check out her reaction just be casual and dont bring the subject that you missed her or not. See what she says about it.

Another thing is that the guy to whom she is kind may be for entire different reasons so dont worry till you are sure that she is hitting on him.

I get a feeling from your description that you guys are still not sure and you both have lot od other available options so dont restrict yourself, go out and talk to other gals as well, god knows sometimes you may get some other person who is more fun, like able that the one with whom you wanna be, just dont put a leash on your mind.

You are pretty young to get into anything serious or may be its like having crushes but just be your self with her and dont go being a cute puppy to her !! I hope i did not offend you by saying this !

Sounds like she likes you - but guessing that she doesn’t really want much to happen, just be her friend and do what you normally do and if something happens go for it!