Sorry, I didn’t see your replies before, and yes I should’ve provided more info.
Here’s the original greenscreen shot. It was my first attempt and I admit the lighting wasn’t great, or proper. I wanted to light her from behind to separate her completely and the key is all the way to the left, I wanted to give her a “noir look” (though I admit I should’ve/could’ve done a better job).
I’ve had several problems with her completely becoming transparent when I used the keylight inside After Effects (I’m using CC 2015), partially I assume because of the lighting and maybe partially because of her dress color, however I realized that her skin and everything else also becomes transparent as in the pictures I have posted previously. However, when I used BCC keying studio it seems to have solved that transparency issue, though I’m still not getting the exactly look I want, as there’s still light and color spilling around the edges (especially hair) as you will see in the pictures below.. I also used brightness and contrast to balance the lack of lightness and made her black and white completely to make her fit the background (although I wanted to just keep her dress color, but wasn’t able to, you can see what I’m trying to get at with this), and I had problems with too much brightness when she walks up to the camera, but maybe it could be fixed by changing the brightness frame by frame? Please take a look, the keying should be better even with Adobe’s own keylight inside after effects but doesn’t..
1) The shot starts with her in a distance in a shadow because I wanted her to appear out of the shadow into the moonlight, so she goes from shadow to a better lit area.

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4) (with brightness and contrast – it especially worked after I keyed it and placed her on rooftop where her cut was apparently darker than the city background behind her)

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