It sounds like you need to raise your value with Zahra. Hand feeding is great way to do this. Start handing feeding Zahra one of her meals each day.
I actually do this sometimes just to get her to eat, she really just has no interest in food unless you hand feed her sometimes or add something really yummy (melted peanut butter, wet food) to her food.
With DH being military and gone a lot I tend to have to walk them together or take them out on a bike ride seperate. I will try what you and your husband do though and start our walk out in opposite direction.