I've had the most success by running the other way and making a game of it. It takes a strong heart to do it when your dog is headed for traffic or some other danger, but it can save their life. Call them in a high pitched voice, make an ass of yourself but try to bring out that prey drive to encourage them to chase.
Use a treat that she gets at no other time; not some nasty dog treat, but real food
Hotdogs, cheese, bacon, chicken...whatever she loves. (Hotdogs aren't the healthiest to use very often though). Keep it as a reward for doing something great, and never give it to her otherwise.
This other way is drastic, but if it saves her from getting squished it's worth it. Obviously don't try it if she has any health conditions, and don't keep it up if it's not working. I don't own the book 'Breaking Bad Habits in Dogs' for nothing LOL
Skip one of her meals, then take her out to work with her. If she comes, she gets it 1/3 of the portion at a time, ie she has to come to you three times. Dogs seem to learn better in threes. If she doesn't, let her wait until the next mealtime (if you feed her twice a day), or a couple of hours if you feed her once. If you free feed her, you'll have to pick it up. Most importantly, do not call her more than once. She has to learn that you mean it the first time. The same goes for any command you know they know.
Shock collars *when used correctly* are also very good for curing dogs of this habit. It makes them realise that they still have to obey whether they are within reach or not. We use them as a last resort in situations where disobeying could result in them getting killed (running off, chasing critters, chasing cars, sniffing snakes etc.). The problem is that they do get smart to them. Our GSP will not leave my side with one on, which is frustrating if I am taking him out for a run or hunting. Without one he'll run and run all day until he decides to come home. Luckily it's 12 miles to the nearest road, but in town he stays on his leash.
I'll dig out the book and see what else she suggests.