Snakeboy’s death curse “die alone!” Will probably mean Harry will never have a long-term romantic relationship. Still, in spite of tremendous bad luck with the ladies and a death curse, Harry STILL has a better love life than Ramirez. Poor Ramirez. Poor, poor Ramirez.
As Malcolm told Harry, paraphrasing, "everyone dies alone." We may have family around us, but we walk through that final door solo.
So, if Christmas Eve does indeed take place after Peace Talks/Battleground and Murphy isn't present, which considering the events that seem to be happening in the chapter five drop, she should be...
So here is what is possibly the reasons why she wasn't;
1] Murphy re-injured herself big time and is in the hospital.
2] Murphy made a Faustian bargain to get into the fight, and alienated herself in the process from Harry.
3] Harry made a Faustian bargain to cure Murphy and alienated himself from her.
4] Somehow whoever it is that was trying to frame Harry and Murphy succeeded. While Harry got
off because of his various connections, Murphy couldn't or may have even take the fall for Harry and is serving 15 years to life in prison for murder.
5] Murphy finds out that she will be crippled for life and wants to go through it solo, her way.
6] While it is possible she became Summer Knight, I don't see that fact keeping her away at
Christmas. Don't think Sarissa would demand that of her, Titania might, but it would have to be really important.
7] Murphy was killed.