Hector
"Well, yes, a normal flesh-to-stone transmutation would have that effect, but my particular version of it only needed for her to muster her will sufficiently to break the spell. I didn't actually want to petrify her permanently, you understand. I was hoping it would last long enough for us to deal with that.. girl-ooze creature, but it appears her willpower is considerable." Hector looks somewhat chagrinned. "A mistake on my part."
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It was a vestige ability that mimicked the flesh-to-stone spell - only lasts for 5 rounds on the outside, and she broke it in 3.