Got a new twist to the story.
I do believe she is trying to cool off in the summer, but she was still digging through the winter whenever we were not watching her. I just found out we have MOLES in our area and her is going after them.
The reason I know this is that one of the little digger was not fast enough and she dispatched him properly. (part here, part over there, some parts missing)
We keep her in a shaded kennel whenever we can't be outside with her or inside when we are home. I am going to put a floor in kennel to stop her from digging it up.
Thanks for all of the in-put
Allen