That is the most beautiful quilt I have ever seen...I have googled several different names for that quilt. But have come up with nothing close to that. The pattern Ying Yang is close but it is not the same as your quilt pattern.
If you ever get the name or pattern please share with all of us...That is quite a treasure you have. I lost my Mom 9 years ago, and I miss her very much. I have 2 quilt tops that she left me and I need to get them finished so that I can pass them on to my two children. God Bless you and your Family.