I wasn't counting my little furry chickens before they snatched.
Of our six earlier family cats before she came into our lives, we only had one who showed much interest in marbles. I always felt badly that I didn't let that guy play with them more. I was hoping that I could make up for it this time around, but you can't force it. This little girl had to discover them on her own.
She is the most active and creative toy-player I have ever seen, so I was optimistic. But cats keep you guessing.