Ah hun. This is so sad. Times like Christmas always intensify these feelings, doesn't it?
Is there any way you could call her? Or at the very least, send her an email message?
I spent some time not speaking to my mother, and, rightly or wrongly, I always saw it as her not talking to me, not caring enough etc, rather than me not talking to her. I think that is just how a teenager's mind works.
So, call, text, email, whatever. You mat get awkward silences or even rudeness, but it will mean more to her than she will admit to you, and even possibly herself.
Big big hugs to you today. You have been a big help to me in my time of need, so a big thank you too.
Duke.
xXx