It was all she had. The only thing she could hold over Sobek was her body, if he didn't believe her threat then she was left with nothing.

"Because he wouldn't call you a God, nor would he ask me to do that." The tears still ran but she continued in spite of her emotions, even as he traced Qetesh's scar with the tips of his claws. He could rack it up to fear, she didn't care, but what she needed to say did matter. "And most importantly, because you've misjudged my motivation."

Vala's mind was thinking on the fly, trying to throw him and Daniel off too. She didn't want Daniel to mourn her or think of her as martyr once this was over, he'd be better off hating her if he survived, and if Sobek was thrown too then maybe he'd take her threat seriously. It was probably the biggest bluff she'd ever try to pull, so she had to make it good.