Chase learned how to role from her back onto her front!
She did it for the first time yesterday. She was on the floor playing with some toys. I turned my back on her for only a moment (don't worry grandparents, I made sure she was perfectly safe - no sharp objects, water or choking hazards nearby) and when I looked at her again, she was playing with the same toys, but on her stomach, with a big smile on her face.
By the end of the day, she was doing it over and over again, like a pro. Smarty pants.