Playing with Marbles: Paranormal Fantasy

She played with their marbles, ratcheting them up in little lines and then shooting them off to bounce around edges and off each other straight to insanity. It was a fun game. She was pretty upset when her mother noticed and confiscated all their marbles and gave them back, but that was what mom's did, she guessed: they spoiled the fun. Then there were endless long lectures about why playing with other people's marbles was bad and would she like it if somebody played with her marbles? She said that nobody could, and her dad muttered, "I wouldn't be so sure about that," with a really uneasy look on his face that made her pay a little bit more attention and be a little bit more worried, but her mom just scowled at him and made him be quiet. That was the last time she was ever lectured by her parents, but she really wished--

Inspiration: A marble mixed in with pebbles in the bottom of the vase of origami flowers I keep on my desk.
Story Potential: High, actually.
Notes: And why does she never get lectured again? Oh, that's because her parents commit murder-suicide later that week, and she's sent into the foster-care system with the really uneasy feeling that somebody messed with her parents' marbles.