What should I do in this situation? [read question]?

Hello flutherers! I’m in a bit of a pickle here. I’ve been invited to a dinner party, a small one, but knowing this hostess, a long one.

Here’s the problem.. She has invited 6 people. My ex-friend, my “friend” (we’re trying to fix the relationship we lost.. awkward situation), and 3 other women I don’t know to well. The hostess is completely oblivious to my situation between the two other women.

Here are the two other women: Truthfully, I cannot even begin to explain how distasteful, rude, and inconsiderate, narcissistic, self centered I find one of the women. There aren’t words to explain what this woman has said to me. (I feel like I’m in a ‘real housewife’ situation here) I am 100% trying to stay away from this woman. I have tried to get over her and given her a 2nd chance, but she just keeps doing it over and over and over again, having absolutely NO idea of her issues. Need I explain more? While the second woman here was once my best friend, changed, cut me off, and has now had a change of heart (or so I think) and wants to become friends again. Awkward situation. It’s just awkward around her. She my ex-best friend, who knew everything about me, and then cut me off, and is now my “friend” again. We are both trying to fix this broken relationship but it’s going to take time. Long, awkward, time.

Now..attending this dinner is eating with this highly despised woman, and a former ex best friend, for the whole night. Well at least from dinner to maybe midnight. It’s just a girls night. But this girls night could end up as a disaster. Maybe not screaming and yelling, but just torture for me having to deal with these women, or maybe just one of them, and the awkwardness of the other. These women, and 3 others who I do not know quite that well. Should I attend for the benefit of my friend. Which would you do? Am I being selfish for not wanting to go for my own needs? If I am, should I just get over the problems of this woman and stop hiding form my fears? Sorry for all the questions, and thank you for all your answers! They are greatly appreciated.