Someday she came knocking at window-pane
When my sorrowy silence stood at brim
Of my mind; and could I meagre obtain
The unblemished consolation from esteem.
...
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At a time when you had given up all hopes of her coming back, she showed up suddenly knocking at the window of your heart! Surely it is a welcome sign, but you are not quite sure of her intent..... she might have come to check if you were 'as fair as the time of the last moon'! A great monologue!
You have been surprised of her return and you have penned the thoughts beautifully. Very nice.