Unlike Sonya and Helene, Marya's big moment isn't a solo- it's a shorter scene. She's terrific in that moment, but during Sonya Alone and Charming, it feels like the whole show stops to highlight those respective women. In My House, for me, doesn't have the same effect for Marya as a character.
I am a firm believer in serendipity- all the random pieces coming together in one wonderful moment, when suddenly you see what their purpose was all along.