I'm mad with her

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Recently, some who I thought was a good friend of mine had a go at me on facebook because of my status which was things I was looking forward to next year. Because I'd done it on my phone, I didn't know that I'd run out of charactors and had to take loads of things off. I ended up leaving off her wedding but didn't mean it in a nasty way, I just couldn't fit it all in as I have a lot of very important things happening to me next year including my own wedding. I explained this to her but she suddenly started saying that I was totally self-centered and an unrealible friend as I would make arrangements to meet her and then cancel at the last minute. This is completely not true as almost every week, I text her asking to meet up and then she never texts me back or messages me on facebook. I'm always trying to include her in things which she says yes to and then on the day will text me and say she's not coming. She's the one that's been the bad friend yet she tried to make out that it was all me. I got so mad at her that I've now completely cut her off from everything in my life but the problem is that my fella is her fiancee's best man and our groomsman. I've spoken to them both and told them that this has nothing to do with them, it's just me and her so they are still friends and I'm still friends with her fiancee. The other problem is that we are going out for her fiancee's birthday next week (he's asked us out) and I know that if she says anything, I'm going to end up beating her up within an inch of her life. So what should I do? He is one of my oldest friends and I don't want to let him down but if anything happens, I'm going to lose a great friend. I know that I will be able to ignore her as long as she doesn't try giving any smart remarks but if she does, I will go mad. What can I do???