I think the fact that she told her neighbor that she had no plans is the most hurtful part. She had plans with Liz.

Was it not important enough to mention?

Nah I don’t buy the story of this poor friend caught in the middle awe she didn’t know what to say to a neighbor. If I have a friend coming over and neighbor asks me what I am doing for a holiday, I’d say that I have a friend coming over. It’s simple.