Namaz fajr, maghrib and Isha can be prayed loudly if no non mahram is present. If a non mahram is present, she should not recite it loudly. As for 3rd and 4tg rakaat, the tasbihat have to be recited slowly but the other recitations can be recited loudly. As for zuhr and asr, the surahs have to be recited in a whisper as well as the tasbihat in the 3rd and 4th rakaat but the rest can be recited loudly if no non mahram is present.