if you look at the red channel seperately there's no sign of the screen in the transparent areas anymore - no wonder a color difference keyer will have troubles pulling a key here. Try a difference key between the green and blue channel. Maybe you can get a hard matte for your character with a non color difference method (eg. primatte) but you probably won't get around some roto. Still...better to roto that girl instead of some transparent stuff...
for a really soft matte of the tissue you could also just subtract red-green....also ibk keyer does an okay job picking up the transparent stuff.
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