The question regarding the posture of salaat for women was poised to me a couple of days back. found this information that others might find useful.
The differences in the Salaah of the females, which have been explained by the Imaams of Fiqh, have been extracted from the Ahadith. We will merely suffice on some well-established narrations to illustrate that the variance in the Salaah of females was prescribed by Rasulullah (Sallallahu Alaihi Wasallam) himself.
Yazid bin Abi Habib reports that Rasulullah (Sallallahu Alaihi Wasallam) passed by two women who were praying Salaah. He said: "When you prostrate, let part of your body cling to the earth, for women are unlike men in this regard" (Maraseel of Imaam Abu Dawood).
Sayyidina Ibn Umar (R.A.) narrates that Rasulullah (Sallallahu Alaihi Wasallam) said: "When a woman sits in Salaah, she should place one thigh over the other, and when she prostrates, she should press her stomach to her thighs in a manner that is the most concealing for her. Indeed Allah looks at her saying: Oh my angels! I make you witness that I have forgiven her" (Baihaqi).
Sayyidina Wail bin Hujr (R.A.) reports that Rasulullah (Sallallahu Alaihi Wasallam) said: "O Ibn Hujr! When you pray make your hands level with your ears. And the woman shall raise her hands close to her bosom" (Tabrani).
The verdicts of many Sahaaba (R.A.) and Taabieen are also recorded in the books of Hadith, which clearly establish the various differences in the Salaah of females. And Allah Ta'ala knows best.
Source: Al-Haadi, Madrasah Taaleemuddeen, Ispingo Beach, Durban, South Africa.