It may not be about you as a person.
Maybe you have a bunch of kids and she is child free and doesn’t really enjoy all the kid noise etc
Maybe you are way more cautious than her re: covid and she doesn’t feel comfortable following the precautions you expect
Don’t go to the gathering just for her sake, go if you want to go but if you don’t - don’t
And of course no passive aggressive remarks to her like “I have misjudged our closeness”, this is the worst!