Woman speaking aloud in prayer in the presence of her mahrams
Question

                Is it permissible for a woman to say Ameen out loud if she is praying and the men around her are her mahrams?
Praise be to Allah.It is permissible for 
          a woman to say Ameen out loud, if she is in the presence of her mahrams 
          and there are no “strangers” (non-mahram men) present, because a woman 
          is forbidden to raise her voice in the presence of non-mahram men for 
          fear of fitnah (temptation). But in the presence of her mahrams she 
          is not forbidden to do so. 
 Shaykh 
          al-Fawzaan (may Allaah preserve him) was asked about a woman speaking 
          aloud during prayer, and he said: 
 
          It is mustahabb for her to recite out loud in prayer, 
          whether it is fard (obligatory) of naafil (supererogatory) (i.e., the 
          prayers in which Qur’aan is to be recited out loud), so long as no non-mahram 
          man can hear her, lest he be tempted by her voice. But if she is in 
          a place where no non-mahram man can hear her, then in prayers offered 
          at night she should recite out loud, but if that will disturb others 
          then she should not recite out loud. But in the case of the prayers 
          that are offered during the day, she should recite silently, because 
          the prayers during the day are to be recited silently. So it is not 
          mustahabb to recite out loud in the prayers that are offered during 
          the day, because that goes against the Sunnah. And Allaah knows best.