Girlfriend didn't get me anything for my birthday?

So my birthday was today, and my girlfriend of 6 months didn't get me anything. She remembered it was my birthday and even told me she knew what she was going to get me. Today we met up, she gave me a hug and a kiss, and told me she was sorry she forgot to get me the thing she was talking about because she was busy with school as well as a musical she is taking part in. I'm cool with it and I tell her that she can just give it to me whenever. She responded with "Nah, I don't want to give you a late present." So I guess her solution is to just not give me anything at all... I'm really surprised because she gave me something really special for Christmas and Valentine's day, but not for my birthday of all days. Do some girls just not really care about gift giving in general? Her birthday is in 2 weeks and I'm really considering just not getting her anything.
Girlfriend didn't get me anything for my birthday?
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