She asked who was coming over on Friday night. I kind of ignored her - she then asked what were we doing at my 'party'. I said it's not a party, it just a hang. She then asked AGAIN who was coming. I didn't answer. She said, "FINE, Nevermind!! You just ignore me"
I got some kahunas up for once and said, "I'm not answering because I feel like you're asking just so you can check up on me and see what I'm doing."
...
Why the hell are you arguing with her? And openly mind-reading?
Next time say something like:
"Joe and Mary are coming over, and maybe some other folks. I'm not sure who all will end up here."