Patricia,
you really did a wonderful job with that quilt, I like it a lot!
When I have very wide borders around an already quilted center I quilt the border clockwise. I start in the middle of one border and go left - because I am right handed and I use a hoop for quilting. That way my right hand lies on the quilted area and I don't rub off the markings with my hand. When you reach the corner motiv you also quilt it and then go on with the next white area.
Does that make sense for you? :)