Yazid Ibn Abi Habib States that Rasullulah (saw) passed by two women who were performing Salah. He told them,
?When you make Sajdah (prostration), then join parts of your body to the ground, bcause a woman does not resemble a man in these aspects? (Al- Marail of Abu Dawud Pg 118)
The above Hadith means that the lady must join her forearms and elbows to the ground and join her abdomen to her thighs. Thus concealing her body and this concealment must also be kept in mind through the other postures of Salaah.