How to politely tell someone they are not invited to your wedding?

Just say that the guest list is still in the works and that you are only having a wedding with limited capacity and a smaller wedding.

Basically sort of saying no but without flat out saying no.

Just say you couldn't invite everyone you wanted to or something along those lines...tbh it would be pretty rude of her to say something like that having not received an invitation and you not being that close to her.

I don't think you have to say anything or at most that you are still finalizing the guest list. She will get the message when she does not receive a formal invitation in the mail.

I just tell people that we're having small intimate with just close friends and family. I have also have told people that we are really tight on space and we couldn't invite everyone who really wanted. Look this is a grown women she should understand that if you can't invite her you just can't do it.

If she says anything at all, just tell her the guest list isn't finalized yet since you're more than a year out, but you're planning on keeping it small: family and close friends.

You might be surprised and she won't say anything. There were some times I was expecting an awkward question or conversation and it never happened.

Remember when a lot (not all, some are just rude AF) say "I can't wait" or "It will be so much fun" They are just trying to express interest. They aren't actually inviting themselves. You have plenty of time so don't stress too much. I always responded with "It seems like its so far away! I haven't even been able to finalize the guest list yet, I'm glad FH agrees with me though; we are keeping it to only family and REALLY close friends. That takes a lot of pressure off." and then change the subject.

As @MrsToBe said, lots of people will express excitement for you and that doesn't mean they are angling for an invitation. Lots of my coworkers would ask me about the wedding or express interest and excitement and all you have to do is say "Thank you!"

Your wedding is really far away still, so if she (or anyone else) seems to be asking if they're invited, just say "we haven't finalized the guest list! But we are keeping it small to save money" or "...because of the venue", something like that.