I dunno if this will help, I don't use any voice cues when working with horses (I don't drive any of them yet so don't need them). It seems to be the easiest way to get a horse to move out without any worry or hassle is to use another seasoned horse as a helper, or a colt, whatever works. You could just have these horses loose together or you could ride your arab and "chase" the other horse. That gives your horse a fun job to do so she isn't worried about her surroundings or her rider and she will likely carry herself better since she is focused on something. Experiment with whatever works, once she gets the hang of moving out with a buddy it will be a lot easier to ask her to move out by herself.


"It's really quite amazing what a horse will do for you, if he only understands what you want. 
And it it's also quite amazing what a horse will do to you if he doesn't." ~ Bill Dorrance