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While I suppose it's a bit irrelevant at this point since it's not coming up in the show yet, I get the impression that wishing Mami back to life would be impossible because Mami's own wish was for her to live. Since she broke her contract by dying, her wish vanishes too, which means she has an "unwish" to be dead. Thus, wishing her back to life would be mutually exclusive with the terms of her agreement.
Narratively the point of this would be twofold. First, give a reason to keep the mentor character dead. Secondly, and more importantly, to not show us the consequences of a MG failing to protect their wish quite so early. Thus, it'll be more dramatic when Sayaka dies (or even simply loses, not sure how that works) and something horrible happens to Kamijo as a consequence. Which further serves to explain why all the other MGs (represented by Kyoko) are so desperate and ruthless to keep fighting.
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