To expect a reply from my friend for a dinner party invitation?

[Happynow]

I invited her over a week ago. A simple "yes" or "no" would have been enough. Having heard nothing, I followed up this morning and she said she couldn't make it. Am feeling p*ssed off since:

a) it's tomorrow
b) it's too late to invite someone else to make the numbers up
c) just think it's a bit rude really

You're not being unreasonable to expect a reply, but why would you leave it until the day before to follow up? Surely you needed to shop beforehand?

What CSWS said.

You aren't being unreasonable expecting a reply, but maybe she didn't realise it would put you out so much, especially as she hadn't heard from you about it.

Yeah, I know, just think it's a bit rude to hassle people too? I'm going to shop tomorrow morning so not too late in that respect.

Well, in future make sure you check up sooner, and have a nice evening tomorrow

That has just prompted me to respond to an invite I received a few days ago - tbh when you get a text message that you assume is a mass send-out, you don't think it is vital or that it will be noticed if you have or have not confirmed.

But no, YANBU