Been dating for almost 11 months, we are very close, very in love and have plans together.
On Christmas Day she lost her mother after 20 days with problems due to surgery.
I'm not one who's had experience losing a family member and I'm not really sure what do do or say really.
Any sort of advice would be really helpful and appreciated.
First of all my condolences. What a sad and sorrowful Christmas it must have been for the both of you.
Secondly, no one knows what to say or do exactly, we all grieve and we all do so in our own ways. Likewise I think we all support those around us who are grieving in our own way too. You just have to be there for her, if you don't know what she needs in the moment, just ask her. If you're not sure how to verbally express your sympathies, say that. An honest admission of the intent of sympathy will mean much more than the most artfully crafted expression.
Lastly, it's been my experience that in the days following the death of a loved one, there can be so much going on that grief can often get postponed. Often times until much later. And people can feel really reluctant to open up about their grief after so much time has passed, but this can be when they need the most support. So just be aware that she might need to vent, cry, or talk about it in a few months time as well, maybe even more than she does now.
My sympathies to both of you.