Roger, your hunch may very well be right. The other thought I had regarding this is if this was the biggest, old matriarch doe in the area, she may have been saying 'back off' to any other deer nearby. I've watched a big doe with a single fawn chase multiple younger does off the small hunting food plot behind my house all summer (the plot is 15 yards by 10 yards wide). Usually just a look from the big doe sent the others scampering, but sometimes she'd walk towards them stomping her feet.