Mine has always had a simmering ennui that life just isn't good enough now, and if only "x" would happen, it would be good/better. Then "x" happens (or doesn't), and she realizes that, no, there's still something to pine for that will be the saving grace. Lather, rinse, repeat. For a long time, I was the good counterbalance to that, i.e., "Thank God I have you because life would really suck". Until I wasn't and became, instead, part of the bundle of things that in her mind contribute to her unhappiness.
Her spiritual path is to learn to feel and experience gratitude and to realize/understand/believe that happiness is inside her, not an outside agency that is delivered to her. Like I said, she's years away and shows no sign of even understanding her issues, let alone doing anything to get going.
I'm on my path, also with miles to go. She just won't be on that path other than as the person I co-parent with, unfortunately.
I hope your holidays are going well and you're enjoying the time with your children.
Me: 46 W: 44 Married: 17 Together 21 D13; S10 BD: 03.03.15 (Not attracted to you) Almost 2 years trying, alone, to save marriage Status now: Divorced (effective 06.13.17)