Hello everyone! Newly engaged and just starting my planning because we both agreed to do it by November 2020 (ahh!). We have been together for 3 years so we are ready. Anyway, in speaking with my grandma who is unmarried and uncommitted and prefers it that way told me "I am going to bring [best friend] as my plus one and I am just letting you know now". Her best friend is not someone I am close with, nor grew up knowing. I only met her in my early 20s. We do not plan on having a large ceremony and people will have to travel to our wedding. We plan on no kids and only allowing plus ones to people in long term relationships, married, live-in, etc. I could use some advice on how when the time comes to let my grandma know she in fact, can not bring her best friend. She is also not contributing financially and my finance and I are paying for everything.
Thanks in advance!