How to broach this wth a friend?

[Countryescape]

Hi. I have a friend , let’s call her Kate. Kate has form for organising to catch up and then pulling out at the last minute. She has no social anxiety and as much as I love her, she can be very selfish too.
On Thursday she invited me out to her place, then cancelled on me as I was driving there because “ she was running late and wanted to do some grocery shopping “. So then she suggests Saturday, okay all good. Then texts that night and says she’s got more Christmas stuff to do, shall we leave it until next week. I sent a fairly direct text and she then backtracked and tried to say she was worried I was too busy! It did annoy me, I’m busy too but chose to prioritise her. How do I tell her nicely that’s it’s bloody annoying. She does this all the time!! I almost feel like pulling out of the catch up tomorrow.

Update: I messaged and said “Hi, I havent hard from you so I assume we arent catching up today. Have a great Christmas xx”. She then came back, with no, no, oh sorry! let’s catch up at 1.30. I said fine, then what do you know she then text and said “actually can we make it 3.30?” I just said no, that doesn’t work for me. She’s seen the message but hasn’t replied.

Obviously it isn't the case here but for me, I have asd and I find socialising very difficult. I don't have any friends now, really and that's because I would often arrange meeting up then cancel last minute.

I definitely didn't think my time was more important than theirs, I just struggled to be in a situation where small talk really didn't come naturally to me. I really wanted to see them and it's lonely with no friends but I know it's not something people put up with for long and it's something I can't help so there's not much I can do about it.

So let that be that start. Don't contact her. Don't make arrangements.

If she texts you, be polite but make excuses if she wants to meet.

You'll find there's no drama and you will simply fade from view.

Perfect. And never ever say a bad word about her to anyone else. That'll bite you on the bum.

Now, got any other friends you can have fun with?

Well she knows now. She'll either keep to the original time or you just won't see her.

Don't be surprised if she turns this around to you not really wanting to meet up with her or some such. If she does do this, you have a stack of examples of her messing you around.

That must be very annoying.

Ball is in her court now though so don’t make any more contact.

What Cobbler said. Don't bother any more. She suggests, you just make a polite excuse. She probably had every intention of cancelling on you again. Well done not being her doormat.

Stop being nice.. She certainly isn't...and tell her to stop the fucking deflecting.. she either wants to catch up or she doesn't.. but stop wasting your equally valuable time...