Throw her toy at the base of a fence or wall or something. Send her straight in to do it. Record what side she turns. Do it 10 times or so and a preference should emerge. Thats her side.
I wouldn't have a helper in there until the concept is really understood by her. One way I realized my dogs really understood the concept of going around the blinds, is when we are doing OB or protection work and they get their reward and are released, they go run the nearest blind anyway.
The other thing I'd do early on, is when she comes around the first blind, call her all the way to a front position, and then send again to the next blind. My pet peeves are dogs that don't look in the blinds, and dogs that don't give a crap what the handler is doing after the initial command. I want my dogs to recall all the way to me if I so choose. So long as they look at me on the recall and begin diverting towards me instead of the next blind, I resume the blind search.
Hunter, CWDC UScA Helper
Beschützer des Jägers v.d. Sportwaffen
Katya v. Hügelblick
SG Aska v. Ketscher Wald
Yōkai v.d. Sportwaffen
Arya v. Allrothaus