My sis (who has always lived a half a continent or more from me, but is my twin separated by birth) and I have talked about loner/lonely. We decided we like to be alone because, "Hey, I like myself!" That being said, quilting can be a project done in solitude or multitude, whatever fits your particular status at any given time. And I am both loner and outgoing on any given day.
Ten years is a long time to be without your sister. I am sorry for your loss.