So in the beginning of week 1 this girl tells me I'm invited to her b'day but hadn't organised it yet. Then it came to just a few days before her party tomorrow so I asked her on msn what was happening and if my mate and I were still invited and she said nothing in response...So I said if im not invited thats alright, ill just do something else and to have a good time. Her response to that was thanks but some ppl are being so rude.

So then I did a freezeout on her and today which was 2 days later, she pokes me in the back and i turn around see her and say happy bday and she gives me some nuts lol. I continued to ignore her in the last lesson and she called out my name once so I looked at her then turned my head.

After school, we walked down to the shops as usual with her friend and i asked her why she was being so nice to me yet i wasnt invited to her party and she said too many ppl are there already, is 1 person too many, then she said if your gonna be a toss, dont worry. Then I said well you invited me before and she said my invites cancelled. Then she and her friend walked off and looked back at me occasionally to see my non-reaction.

TL;DR: Girls says I'm invited to her 16th party then changes her mind yet we had no dispute. She's apparently my friend but doesn't look like it right now.

It's now the weekend. I need some advice. I feel I gave her my power yet at the same time, what she's just done seems ridiculous. Should I talk to her Monday? Or just continue to ignore her. She is the type of girl who has plenty of guys chasing her and I never make an effort to be that type of guy. In this case I feel I have by not acting unaffected.

Sorry to tell you man but by your reaction and constant nagging about coming to her party, you might have already given her the impression that you're needy.
Someone made a post the other day saying how guys are generally starting to abuse the game, by never giving girls compliments, constantly teasing them and so on... and it seems to me that by you playing the game on her she's got annoyed and actually lost interest. Remeber the game is to light up a bit of interest and a guideline to roughly on how to be strong and keep her wanting more... its not a way to control women and have them doing what ever you want them to do.

I agree with you giving her a freeze out when she told you that you're not invited because you want to punish her for doing something you dont like.
However, when she came to you all happy on her birthday and gave you attention you should have responded positively by giving her by being happy for her, talking to her and making her feel special. You should reward her for giving you attention i.e doing what you want. If she come to you to speak to you spesifically and you walk away you're punishing her for giving you positive attention... she's going to stop giving you any attention all together.

Let it go bro, dont carry on nagging her about her birthday, when you see her again ask her how it went with a smile and then move on, dont linger on feeling sorry for yourself for not cracking an invite, just show you care. Tell her it all worked out fine because you also had a great weekend. and then drop the whole situatiuon all together and start being nice to her man.
You can pick your game up bro, just be confident and generally a nice guy, the interest seems to already be there so dont push her away anymore.
Good Luck!

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Peace, Finchy!