This is super sad head canon because she obviously didn’t go. I imagine she threw it away but not without *dramatic wistful stare* first. I think Lin probably felt pretty sad about it, but her pride wouldn’t allow her to go to something like that without a formal apology, especially so soon after the initial incident.
I did some super vague math the other day regarding Su’s kids ages etc and I think she and Bataar probably got hitched when she was around 20-22. Which means the wedding was within a few years of the whole face slash/getting away with CRIME thing. In Lin years, the resentment is still so fresh.
So, yeah I don’t think she went and she probably tossed the invite out.