mmmmmmmm....is it a secret reason
From the back Miss Simon looks like a sable banded. You can tell a sable because they have pale creamy rings round the eyes and if you blow on the coloured fur you will find it is black/grey at the ends but the undercoat is sort of cream colour. If she does not have these things she is likely a black banded. She has a very nice even band. Not sure from the pics if she has some lighter creamy/orange patches in the darker colour. She could even be a tortoiseshell.