Yes, the Wal-mart shopper accused of operating a motorized cart while drinking wine and high on meth should be charged with DUI. She was operating a motorized vehicle while under the influence. The fact that she was not on a public road should not matter. However, Wal-mart, as a key part of any case that would follow may not want to press the issue.
People over-utilize motorized carts in Walmart even though they aren't disabled. This should be outlawed. And yes, she could have injured other customers near her, as well as employees, and thusly she was causing disturbance to the store. She should be charged with a DUI, or she'd be setting a bad example.
A motorized cart is a vehicle and could cause grave bodily harm. Therefore, those who operate carts should be held to the same standards of safety that drivers are held to. Any time the safety of our fellow citizens is threatened, we need to evaluate the importance of creating guidelines and laws that counteract the issue.
A DUI is in place to help keep the person operating the vehicle and those around them safe. Operating a motorized cart does not pose these same risks and therefore a user should not be at risk for a DUI. If so, then where to we draw the line? Should a biker (literally a bike, not a motorcycle), or a person on a motorized scooter while high or drunk be charged with a DUI then? Leave the DUI to when severe harm can be inflicted.