Crikey, what is it with women and weddings? It seems to bring the worst out in all of them, even the bride!
It�s a bit sad that you, as a friend, didn�t get an invite to the wedding reception and that probably should tell you something about how she values your friendship. Having said that (and I repeat) there could be loads of other reasons she didn�t invite you, I didn�t invite some of my friends to mine � c�est la vie.
I think if you are really miffed just ask her why you weren�t invited. I certainly don�t think she should be made to feel guilty or owe you an explanation. It was her day and she had the people she wanted to make it a wonderful day, just because you were left out of that doesn�t make her Mrs Evil.