It's really hard to tell from those pictures but she doesn't look too bad to me. In my dogs I like to be able to feel their ribs and see a prominant 'tuck up' from the side. The amount she is fed should depend on the amount of exercise she gets. One cup in the morning and another at night sounds about right, though.
And about her checking out while doing agility...I think that has to do with the kind of relationship you and Zoey have. How much time do you spend alone with Zoey? I would definitely take on feeding her (maybe hand feed her or have her work for her food), but in addition to that just spend time with her. Also how often do you usually do agility? I know that if I spend too much time practicing with Jack he gets bored and loses interest really quickly. I spend much more time doing fun little agility/obedience games for a few minutes multiple times a day and it helps to keep him interested.
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