Keying with a green object in greenscreen

HI Guys

i’m not so experinced with nuke…

so i have a problem. I try to key a video on greenscreen but the problem is that the girl in the video has a green cup in her hand. So it disapear when i key.

and i know it disapear becasue of the color of the cup:p

but how do i get a new GREEN cup in her hand?
I am trying to use rotopaint to restore the cup but she moves the cup all the time so the cup looks really ugly.

please help me Aezz

ps. excuse my English

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