I know it's difficult to do, but you need to let it go. I do think she sent the missive just in time to ruin your holiday. Don't give her that power. The more she claims that they are so happy and living the life of riley, the more I'm inclined to believe that they are just roughing it and living day by day.

N, spend the holidays w/your parents. They are and continue to be your strongest supporters. Time is so precious and we just never know what tomorrow may bring.

Enjoy the holidays and I do hope you have more work lined up upon your return.

Sit quietly, the answers will reveal themselves when you least expect them to.
The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.