Why wouldn't she invite me to her birthday party?

Anonymous
A girl that I like (we are NOT dating) but I wish we were. She is having a birthday party tomorrow and I don't think that she's going to invite me :( if she doesn't invite me does that mean that she doesn't like me and doesn't even consider me a good friend? But before you answer that here is more information: we flirt with each other a lot and half of the time she seems interested in me. We have been good friends for 3 years but have just started hanging out outside of school this year (going to the carnival, movies, etc) and all of her friends that are going are friends of mine too so she shouldn't be worried about them not wanting me there. I'm not boring at parties I'm always the life of the party type person who is always making everyone laugh (especially her). Also when one of our mutual friends had a birthday party back in October she was the first one to invite me and REALLY wanted me to go and she was very happy when I did go. So why wouldn't she want me to go to her party?
Why wouldn't she invite me to her birthday party?
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