<respectfully snipped>
I have chased stray dogs in some dangerous places and taking some risks, even on a highway. But, if I could not catch the dogs in a certain distance, I don't know 25 yards 50 yards, on a busy road in the woods I personally would know when to stop trying to get the dog. I believe all of my friends in dog rescue would say the same. Now, for one of my own dogs I would take a much bigger risk. But, if a dog you are trying to get so that you can help it doesn't come to you when you kneel down and hold your hand out chances are you're not going to get it by chasing it. The more you chase it the more and faster is going to run and you do not want it to run into the road.
I always have extra leashes and treats in my car and that is the way to get a dog to come to you, not by running after it. And, I bet she would know that. I would not be surprised if she kept treats and extra leashes in her car.