Executive Summary:
Congratulations. You are interested in a very smart girl. Secondly she is guaranteed bona-fide 100% trouble. You are also reading too much but I am personally think she is under taking these actions on purpose. More detail follows.
Reading too much: Regarding the book yes it is reading too much. But more specifically she would be doing it on purpose. Remember this are all assumptions based on a very limited knowledge of what is happening based on your view point. She could have easily been interested in just the book, nothing to do with you.
Football - both could have been busy. Gone shopping, busy with the family etc.
Clapping - again reading too much.
Devil woman: Now this is why I say she is trouble. Each action taken on its own is insignificant. Together it is a dastardly plot. (I just love using that word - dastardly :D ) As you have already pointed out each act was simple, yet personal. Not really intimate, but personal enough to attract your attention. That would be her goal. They are impersonal to others watching but can be considered personal depending your "history". Simple actions that reel you in. Which is exactly what they have done, you are not wondering, wait is she actually interested? Why was her previous reaction like that? I should find out more.
Your woman is the type that wants what she can not have. She likes attention and the acts of indifference have basically made her step up her game. You my dear boy are royally screwed.
I of course can be wrong, but if i were a betting man, I would bet once you show interest in her again she will go all ice queen on you. Now you can play with her to find out what exactly she is thinking. The choice is honestly yours. I would recommend, packing up and running. Such a woman is only a headache.
However if you are interested in really speaking with her, your actions would have to be "significant." I would suggest you have a chat with her like Suji Halwa is stating. But you use a different tact. One ask her to meet up after class or something. She will say no, but say you wish to talk privately and that she can decide where to meet. Be persistent. Show interest.
Now if she is the girl I am assuming she is, she will toy with this a bit. She will not give you a direct answer, because you have shown interest in her again. She will not go ice queen right away, rather she will entice you with other small "personal" actions. Trying to reel you in again but keep you stringing along.
What you want to see is if she is willing to speak with you privately or not. Don't ask for her bedroom or a hotel room. Say we need to chat, outside of class and let her decide where and when.
Of course Suji could be right and she will accept you can chat it out and when you get married you can blame me for all the troubles in the world.