It's a b!tch that we're in the situations that we are. Nothing wrong with wishing her a happy birthday, and you feel OK about it...so no biggie. It's good for you to do things that are good for you and to you.
I hope you have a great Christmas with your daughter.
antlers
ps - I understand very well about you 'missing' some things that 'were'.
"Always go straight forward, and if you meet the devil, cut him in two and go between the pieces." - William Sturgis, clipper ship captain, 1830's.