Tonight is my oldest friends surprise engagement party. Known about it for a month. I was dating someone for 2 months but I ended it last Sunday because he kept speaking and meeting up with the girl he was dating before me claiming he was "in love" with her. Anyway obviously he isn't my plus one for tonight any more. So I asked my sister. She said she would come along with me until I just heard her on the phone to my DM saying she's had an argument with her finance and said she didn't feel great and didn't know if she was coming with me any more. She hasn't told me this herself though and I know her and she's in a big mood so that will be why she doesn't feel like coming and not any illness. My other close friend is pregnant with 3 other children. My other close friend has no one to baby sit her daughter and then I have no one else to ask.
I'm petrified about going on my own. I know my friends family but wouldn't say I'm close to them and would just be making small talk. Her other friends I know of but not well and they all have partners who they are bringing. The other guests I don't know at all. I don't want her thinking I'm being funny though by not going. I found out last week she didn't ask me to be bridesmaid which hurt but her decision and I haven't said anything but don't want her thinking that's part of the reason I wouldn't go.
So what would you do?