Ruling on a woman correcting the imam in prayer

If a woman prays behind men, and the imam makes a mistake in reciting the Qur'an and does not correct it, and the woman knows of it, should she correct him?
If this is in al-Fatihah, it is obligatory for her to correct him; because if he neglects al-Fatihah, his prayer is not valid. As for if it is in other than al-Fatihah, and the men are among her acquaintances and it is not strange for her to speak in their presence, then she may point it out to him and there is no blame on her; because a woman's voice is not an 'awrah (part of the body that must be covered),And the evidence that it is not an 'awrah is His saying, the Exalted: [al-Ahzab:32] So the prohibition against softness in speech is evidence for the permissibility of speech.