Everybody, who thinks this is OK, should think again - what if Anna genuinely didn't like parties, you at parties, music at parties or whatever else. Re-invating in that case is disrespectful, intrusive and even rude as all interactions need to be feedback controlled. Sure, any generalization will lack the subtle cues of context but its safe to say that this was an exceptional situation rather than representative.
People who seem to like this story for the feeling of warmth seem to me to be the similar ones as those who "save food" for the children of Africa - disconnection from the reality is huge.