How To Recite The Qur'an
Question :
Is it permissible for a woman to read the Qur'an. silently? Or must she recite it out loud and slowly?
Answer:
Reciting the Qur'an slowly is not compulsory, neither for male nor for female, yet doing so is considered to be one of the etiquettes of recitation. Among the best forms of recitation is that one would do so slowly and ponder over its meanings and come to understand it. One may recite it more quickly under the condition that none of the letters are skipped. As for reading out loud or quietly, this depends on the person: if one feels more alert and concentrated by reading it out loud, he should read out loud, but as long as he is not disturbing anyone. If he feel more alert and concentrated when reading quietly, then he should read quietly. And if both are equal, he may choose as he wishes.
Source:
Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 7 Pages 27-28