First, I would see her bone in their pen. Hum, interesting. Yesterday, I saw toys in the play pen that I had not put in there. Today, she was in the pen playing with them. Well, they were just interested in trying to nurse, she was doing her best to play with them, so cute.
Update for Ari's new mom: We are starting to see some playfulness come out. She will chase a thrown ball now and pick it up. She chased Cricket a lap around the yard which Cricket just loved. When Cricket tried to chase her, not so much fun as Cricket is very verbal when playing and I think scares other dogs. She always has a toy on her dog bed now. All in all, I am so happy to see some playfulness starting to shine through.