I totally understand why you're upset, @calypsolypso . It must be very disappointing and hurtful to be let down at the last minute like this, especially if you were really looking forward to a Christmas where all of you would be together for the first time in a while.
A bit of a MN pile on seems to be happening here- your DD is now being labelled snobby, selfish, thoughtless, ungrateful, etc. by other posters which strikes me as unfair, and I strongly disagree with the suggestion that you should read her the riot act. Please don't be sucked into this narrative that she thinks she's too good for you and the family - you know her best, not anonymous posters online.
The fact its, at 26, she's an adult who can make her own decisions, some of which you won't like. She's entitled to have her own opinion of what makes a good Christmas Day (child-free, it sounds like) and how she wants to spend it. She's also entitled to form her own view as to how close of a relationship (or not) she wants with her siblings and nephews and nieces. That may change as time goes on anyway, none of us know what the future holds. You can't force her share your views and values, and any attempt to is likely to push her further away. What interests me here is not that she's chosen not to spend Christmas with you all - it's that she's told you last minute, over text, having previously said she would be there. Why is that? Is it because she's thoughtless and selfish and truly doesn't care? Or is it because she was avoiding making a decision or communicating her decision to you? Was she afraid of a 'telling off' or a guilt trip - real or imagined? At her age, and given her professional accomplishments, she's clearly a very bright and capable woman who has to communicate clearly with others and be firm at work. Why doesn't she feel she can do that with her mum? She seems stuck in teenage avoidance when it comes to family - why? When she's delivered bad news or disappointment in the past, has she met with a negative reaction or an uncomfortable situation?
In terms of a way forward, would keep it light for now and simply say that you hope she has a lovely day and you'll give her a ring at some point to wish her a merry Christmas. I wouldn't mention being upset, disappointed, angry, etc as this is only going to put more pressure on her.
However, I would then have a chat with her once emotions have died down - probably some time in the New Year, and ideally face to face - and tell her that you have no issue with her spending Christmas wherever she wants, but she needs to be clear and honest with you. Make clear that you were disappointed not about her non-attendance, but about her late communication, and how it made you feel (disrespected? Not worthy of consideration?)
I feel like this Christmas cancellation is the symptom of a wider issue, which is absolutely worth trying to get to the bottom of - but emotions are always heightened at this time of year, so only once you've had a chance to reflect. I hope you can repair things xxx