First, make sure this is truly fear. Do her ears go back/flatten? Does her tail drop lower than normal (i.e. lower than she normally carries it)? Does she cringe/lean back away as she sees your hand? Is she normally skittish? If so, she may be fearful.
If she is indeed afraid of your approach then you'll have to make her more comfortable with your presence. If she's running out of fear, chasing is just making her be right (i.e. "yeah, they are after me, I better stay away")
If there's times where she's okay with your reaching with your hand, praise and treat with a VERY good treat. Keep it small because you don't want to add too much food to her diet and also because you want this to go quick so you get lots of repetitions in a short amount of time. Do this for a few minutes, then praise and leave her be. This will let what happened settle in (latent learning) and also give her time to unwind and relax as she's probably still got some "ready to run" inside her the whole time.
Fearful dogs can take time to trust and adjust. Be patient and keep trying to work with her. As she becomes more comfortable with you
If this is just her trying to start a game with you, again, don't chase because, again, you're making her be right (i.e. "yeah, they are playing the game with me!")
Work on this in an enclosed area. Call her to come and if she runs as your reach to pet her, withhold any reward and just ignore her. Show her you won't be playing into her invitation to a chase game.
Call her again. If she stays put when she gets close and you reach to pet her, praise, treat, then do it again. Move back and call her. Every time she stays near - praise, treat.
Show her that to get good things, she stays put near you when you call her to come. Eventually, she'll understand.