Is it normal for my friend to act this way?

Ok well about a few weeks ago I saw my friend, gave her a gift and everything was fine and sorta normal. Only then a few days after on facebook she just starts ignoring/avoiding me, if I did normal stuff like write on her wall/status, message etc. (I never wrote anything mean or offensive that I know of) she completely ignores me without telling me why. It's bothering me so much and I think she knows that. I can't ask her why she's doing this because I tried and she just keeps on ignoring me. well, she could be busy with college but she talks to everyone else..just not me. It just dosn't seem normal to me.