If the camera doesn’t move, you can use PIP and have the pics cover the window, and her hand would still be behind the pics. Besides the chromakey filter in Vegas doesn’t work well with DV footage due to the 4.1.1. color space. Putting a Chromablur filter set to medium before the chromakey helps alot. If you do re-shoot with green paper, make sure it is flat as in not shiny and is wrinkle free.