Give me A summary of the mirror girl- stares back at you by Emily dickinson?

Basically the poem is revolving around self image and inner image. Your reflection knows everything about you, because it's you. Sometimes your reflection can look like a different person and sometimes you yourself can feel like a different person. So which one is real? The one that looks like you or the one that feels like you? And the more you inflict pain on your inner self, the more the pain is revealed on the outside.