What does this girl's silence mean?

[Anderson]

This has happened recently. I'm in third year and this girl is in 2nd year. I saw this girl many time around in college .

This november we became friends on facebook but never interacted. [i have 2 facebook accounts n she was in my friend list in both accounts. now only in 1 :-( ] My exams got over and i couldnt stop thinking about her. and so to pass my time doing something productive, I sketched her picture during my vacation in november to give it her on her birthday (28th Nov).
Our winter vacations got over and our classes started on 26th Nov. The day before her birthday, i was standing in the corridor, when she along with her friend were leaving from her class. and as i was looking at them, all her friends were smiling at me except her. she was feeling shy at some point and was hiding behind her friends (i think they all know that i like this girl) When i told one of her friend to call her, she looked at me without giving me a smile. and i tried to call her again to give her a smile but it became rude the second and the third time. Same day, i'd sent her text on facebook as why she was so serious?? but she did not reply, but blocked me.

Next day i went to her class to give the sketch to her on her birthday, but she was absent and had gone somewhere along with her friends. and so i left the sketch with one of her friend who had come to college.

Next day, her friend came to me and told that she didn't accept my gift as she didn't know me itseems. Then i told her to give it to her saying that she's my facebook friend. n so she accepted it later. Later on the same day, i sent a text message on facebook (from my other account) thanking her for accepting my small token and hoped that she liked it and asking her whether we can be friends or no.. But she didn't reply, although she saw my message. she didn't block me either.

Next 2 days, I saw her in college but she was silent and wasn't making eye contact, but her friends looked at me. All her friends looked at me except her.

What could her silence mean? Should i wait for her to respond or should i forget this girl? [but i like her :-( ]

help me..!!