Had a quick read and my initial thoughts were similar to Pawfectionist that it didnt sound like at this stage too big a deal. My thoughts were also that you broke the routine of not playing with her was the problem. I have left single dogs at home for long hours while I worked and regardless of anything I always had that routine of exercise before and after work. Sometimes I was walking the dog at midnight lol. It is essential for high energy dogs and miss that routine at your peril.
As to marrow bones, some of my dogs have been very heavy chewers and I often left a marrow bone. The trick is to scrape out the marrow and cut off any excess fat for dogs that are prone to overweight or potential pancreatitis issues. The cartilage on the head and the honeycomb structure is good for the teeth, my dogs teeth are all shiny and white even in old age and have never had dental issues. Mine usually eat right down till just a little knub of solid bone of the shaft is left. I ususally have them cut lengthwise and then in quarters so they get a quarter. I am pretty sure that feeding kibble is not enough for dental care, certainly has not been for my dogs. I tend to give them a bone once every week or two and that seems enough to do the dental job.