@NexusInfinity : On the old man side- because he didn't stay after that so for all he know she could've just left soon after and still caught cold from that time she was with him out in the rain, cuz y'know girls are so weak.
He didn't tell the prince about her likely both from the extreme terror he felt initially and because by etiquette if you say something without prompt from the noble, they might take that as slight and punish you for it.
And when the prince went to check on all the sculptors, obviously whoever made the list only listed people officially recognized as sculptors, not the maid who only sculpted the statue that one night and never mentioned having knowledge of sculpting to anyone prior.
As for the statue, I think it's around the eyes area.
The previously one had a more queenly/dignified looks to it with straight eyebrows and the upturned looks, whereas post-Marie she now has a more motherly/gentle looks with the eyebrow drooped slightly at the end and the almond shaped eyes.