If she is healthy,at a good weight, and has been on this schedual since she was 6 months,then I would stick to it and not change it.
"Some" Labs tend to become overweight if free fed.This because they will eat all day.And trust me,I have seen many overweight Labs...And that will definately cause health issues.Which is something you don't want.
My GSD's have been free fed dry when they were pups.That's only because they were not hoovers.And they also got canned 3x's a day..So the dry was left out for snacking.
Oh,and congrats on your new furbaby.
And don't forget to post pics..
