As I mentioned, I bought Charm a nice pink (cheap) ball, to see if she would run and play with it. I doubted that she would run around like a playful gelding. She targeted the ball a few times, tried to bite it, pushed it once or twice, then tried to bite it again, and it popped!
So, the ball is not her friend any more.
Well, we did target the deflated ball, then went on to the hoola hoop :-).