Bismillahi Al-Rahmani Al-Rahim
Muslim Women With Non-Muslim Women (2)
wa al-salamu `alaykum
A s-salaamu 'alaikum,
"According to the madhhab, it is permissible for a women to show another woman--even a non-Muslim-- <<the area between her navel and her knees>>."
Did you really mean that which is between the braces above << ... >>?
I bet you wrote this when you were meant to be sleeping?! Get some rest Musa! Can you correct this please so that people don't get the wrong idea.
As for the issue then i think you will find:
The Awrah of al-Hurrah al-Balighah is: All of her. [al-Insaf 1/449]
What she can expose to her women folk:
Head, hands, feet and the places that she wears jewelry i.e. neck, forearms and anckles. (or as shaikh Abdullah ibn al-Fawzan says: what is usually exposed (ma jarat bihi al-Aadah)from that which does not cause fitnah).
Thus they can't reveal everything except that which is between the navel and the knees even to each other.