Random Invite

So this does not pertain to my wedding... I just want some other thoughts and feelings. Some back history is that my "friend" Amanda and her wife were married five years ago kind of quickly on their 10 year anniversary and no one really knew about it. We were closer back then bc we worked together at that time. They did not have a party or anything at that time. Every year since then she has randomly talked about having some kind of celebration but financially couldn't do it. I left that job about 2.5 years ago and we have stayed mildly in touch. I have made several attempts to make plans and when we do she's either late, forgets about them, if it's a group thing will go off with her wife in their own or do their own thing. This "friendship" over the last year from my opinion has completely dissolved from my POV. I have told my fiancé that the energy I put in is no longer worth it. I occasionally help her out and fill in at her place of work when she needs me but otherwise I haven't spent time with her.

So I receive an invitation to their five year anniversary, which is a "dinner" 1-4pm on a Saturday and enclosed is her wedding registry.... which I am kind of taken aback by. On the invitation they even included please don't bring any unexpected plus ones, thank you. One day when I worked with her she asked me what weekend I'm available in October and I said it really depends bc we are getting married on the 26th. So she specifically asked for dates and I told her I was free the 12th (assuming the dinner would be at like 5pm). What would you do? Honestly I do not want to go. I feel like it's a weird way to get "wedding" gifts five years later. They are not invited to our wedding bc we are just having family but next year we plan on having a reception for our friends. We don't have a registry. If we have a DJ and a full out reception the maybe I would "expect" gifts. However if it's just a backyard BBQ the by no means would I.

It's annoying bc I have cut her from my life and now there's this curve ball.

Thanks for reading!