Hello and welcome. Christmas can be a hard time for many people. My mom died on Christmas Day 20 years ago. I still miss her. A friend of mine made a comment about loss and the pain it gives. 'You will never forget but the times between remembering will get longer." Doesn't mean you will forget mom, just that the pain will ease.
I have suggested to others that they have a remembrance ceremony of some kind. It's not morbid or anything like that. Gather friends and family who were part of her life and invite them to a/tea or similar. Get out the photo albums, ask everyone to bring theirs, talk about mom and the family jokes. Talk about why you love her. Perhaps you can plant a tree or bush in her memory. Remembering is a way of honouring mom.
I think it helps to know others care. Be kind to yourself. Grief is hard and the more you love someone the harder it is to part. I cannot tell you when it gets easier because it's different for everyone, but I can say it will get easier. When we have our down days the world seems black without mom around. Can you think what she would do and say in a particular circumstance and try to do that. We need to comfort ourselves as grief is so exhausting. Not that I am suggesting you should not grieve. I would be surprised if that happened. Remind yourself of her love and care and try to care for yourself in that way.
Writing here can help so please feel free to talk about anything.