Hi Beth, I have a similar story, but my mother cut off our contact, for around 5/6 years, maybe more, I can’t remember. No birthday messages, Christmas, nothing.
As you said, the word is acceptance.
It was very difficult to accept it or understand.
But I learnt she is an individual and not just a mother. So I learnt to see her as such.
I admit I feel lonely at times and I feel my life would be nicer maybe easier at times, with her near. It’s very strange and I don’t understand. But it’s not up to me to understand. I don’t need to understand.
I haven’t tried writing a letter, I still find it difficult because I don’t know who I am actually dealing with, someone who wants to hear from me, or not. I left it aside.
One day I will meet her in person, I hope she will see me.