What should I do about my girlfriend ignoring my birthday?

I have been dating this girl for a year and things have been going great. About a week before my 27th birthday she told me she was going to visit me on my birthday, take me out to dinner the next night, and get me a card. The morning of my birthday she told me happy birthday, so its not about her forgetting. Rather she never did any of the things she said she was going to do. I spent my birthday alone, she never took me to dinner, and I never received a card. It has been about 90 days since my birthday and I am not sure how I should feel. I don't care all that much about my birthday at this point in my life, but I got my hopes up when she told me she was doing something special for me. I at least expected a card because I did make a big deal about her birthday, and also that this is my first birthday after dating for a year. She keeps saying that she has been busy with work and that she still wants to do something even though it has been a month and a half. How should I be reacting to this? She even bought a special dress for the dinner, that I have never seen her wear.
What should I do about my girlfriend ignoring my birthday?
Post Opinion