What's going on with her? What should I do??

this hot girl who looks innocent and very quiet who is a nerd which i love nerds don t know why maybe because they wear glasses.... anyways the first time i talked to her was before summer started... i said i was shy she said dont worry i am too... i talked to her because i always saw her when i was going to my class and she was reading a book and when i turn to her i saw her looking at me then look back... anyways after i talked to her i never saw her in that spot i felt like she avoided me... now on summer i felt like she avoided me again lol.. because i talked to her on the first week of summer school and she didnt look at me not even the other way, she just kept looking straight didnt asked me anything but answered if i asked her something and that happen when i talked to her the first time but the first time i could tell by her expression that she was being shy.. the second time which one was on summer i felt like she avoided me or hate me maybe im overreacting

anyways i ask myself why she didnt looked at me when i talked to her, just kept on looking straight without asking me anything just answering... the funny thing is that i try to avoid her so i dont make her feel like im stalking her and i kept on bumping on her... like seriously lol...