User blog comment:Chopper4PirateKing/Chapter 742 - The feels/@comment-71.13.82.190-20140326193112/@comment-2109035-20140327122714

If her powers were active at all times, then she would be eating little toy grapes 24/7. She was trying to kill him with the grape, and seeing as turning him into a toy first would make the "poison" useless, she didn't turn him into one. It's not a Midas-touch type deal she's got going.