Well clearly we all know who one of those women is. As for the other, does it have to be someone in the GDF? It could theoretically be one of MT's staff or someone else working for the Cour.
The MIL, for sure, but the others? Didn't Tessy and Louis live abroad most of the time? And Claire and Felix mostly in France, as well as Alexandra in Paris!
there probably were not too many chances to be together so much.
Although Tessy always propagates her ambition, empowerment of women etc. I believe that she is not really an honest friend of women. She feels it as a competition and probably gets better along with men. The whole image she is presenting is mostly to attract men,the sexy image she is showing again and again. She quit her good paying job during her divorce, because she could not get along with her female boss.
And again, Tessy talks and talks, everywhere. The others don't! There are always two sides in a conflict. We only can judge from what she makes public, the other sides we never hear about. Therefore it would be unfair to judge, because we do not have the whole picture.