
She is more likely to come back when she is young and unsure of the big wide world, so let her off lead as soon as you can and train her to come back by being very exciting to be around using toys and treats etc.
Never chase her but move backwards if she is moving away so that she follows you.
With independent breeds especialy it is a BIG mistake to wait until they are older more confident pups or weorse still tenagers, as that is when they will thumb their noses at you as everythign else will be of more interest to them.
I am assuming you are already calling ehr to you at thome and in the garnden, and never call her to scold?
Barbara and the Grey Curly Tails.