Forgot to mention. I did let w know that D and I would be going to my parents for Christmas. I said, I want to let you know that you are welcome to come, you don't have to answer now, or ever, I just wanted to let you know that you are invited.
She thanked me, and said she really wanted to, but wasn't sure if she could. Proceeded to tell me about what she foresaw in her Christmas future, (staying home, chinese food, being alone)
I said , "whatever works for you" and let it be. I won't bring it up again. She knows that she's invited, and I know that I did the right thing.