Sure, you can go to the party (and go through life!) with attitudes of, "♥♥♥♥♥ that person! I'm the better person, and I'm taking the high road! This is not about my enjoyment, it's about A's!" ..... you could go to the party and
endure it as a tribute to your pal (What a fun party attitude!
) or totally turn your back on 1/8th of the guests or punish her by forcing her to be gracious to you.
OR.... you could look boldly at your own gunk, take a look at what is the old pain decision that is getting reactivated here and is taking away your power to be the mistress of your own state. Woudn't it be nice to find out what your unconscious old pain -- that has absolutely nothing to do with C -- she just happens to be a generous reactivator for you, an angel who is delivering the opportunity for you to resolve this old pain for good -- and to feel really FREE to feel the way you'd like to feel, and to joyfully celebrate your friend's big day, free of any old gunk bugging you around the edges?
Just askin'.