I do sympathise. I lost my DH 5 years ago and I have 3 daughters too.
I can be very aware of being on my own and it is made worse by the feeling that the “other” grandparents /parents are seeing more of them than me.
There may be a reason. The daughters each had in-laws or a parent with them this year. It was D2’s FIL’s first Christmas since his wife died and D3’s in-laws were on their own as their other two AC were abroad and working. So I went to D1. A fair distribution of “Mum”. But there are other times when I feel I am missing out and it can be hard to keep a sense of perspective when you are lonely. An example might be that I used to hate turning up and leaving on my own when at “family” events when everybody else seemed to be in couples. It was a hard lesson to get over that, but I have-sort of.
You don’t say what your other daughters did over the Christmas period. It may be up to you to take the initiative.
Invite them to lunch. Invite them to an entertainment (the film of Matilda the Musical is good if they are not too tiny) or take them all out for a meal Pizza Express or Harry Ramsdens goes down well with children)
But you need to take matters into your own ands, not sit waiting to be taken into consideration ( even if you should)
You will be happier for it and your D might realise -without being made to feel guilty - that she and the children enjoy being with you.
