To treat her, we removed all corn (maize) from her diet, supplemented her feeding with melatonin, changed her environment frequently so that she couldn't develop a set pattern to her running, and exercised her by running on teams as often as possible. Today her behavior is no different than that of any other dog in the yard.
A couple of days ago I noticed a change in her feeding behavior. In my opinion, the first step in addressing any sudden change in behavior should be a thorough veterinary examination. In Grace's case, that examination found two teeth that were hurting her. They were extracted yesterday, she spent the night in the house last night, and was put back in the dog yard this morning.
Here are two photos I captured of her just a bit ago. As you can tell by the lip-licking in the top photo, she isn't entirely comfortable at the moment. She is nonetheless coping and seems to well on her way to a full recovery.
