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Mostly what Dawnstorm said. Presuming for a moment that Sayaka actually has enough magical power to pull off such a wish (that wish is a tall order; I'm not certain Sayaka would be strong enough for it), she was mostly focused on Kamijou. For her to think her wish through to that extent would require considerably more knowledge of how wishes and the system as a whole works than what she had at that time. We see as much through Madoka; it took her the entire series to reach the point where she could make as carefully thought out and detailed a wish as she did.
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