Navicular really shouldn't be causing stiffness. Navicular is where the navicular bone has been put under stress and has degraded by either eroding or ossification. It really has nothing to do with "getting the blood" pumping. It can be easily managed and kept from getting worse by corrective trimming, not necessarily exercise. She may have navicular, but I've never really heard of a horse with it improving in soundness with exercise, and getting stiff or off when not exercising.
How was she diagnosed with navicular? Were radiographs taken? That is the only way navicular can be diagnosed. By the way she's standing in the second picture I would say she's got some pain going on, but it doesn't really look like heel pain?
She is very cute, btw. Congrats on getting her.
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