On her machine, run MSINFO32.EXE
Under "System Summary" and under "Components" (especially Problem Devices") you will info about specifically which model Vaio and about the WebCam. Info about her laptop and the problem hardware will be helpful.
Does the Sony site indicate if the the utilities software is Windows 7 compatible? Does Sony offer a "chat" capability so that you can inquire by them about your webcam problem? I have a Toshiba and an Asus and both of them offer a "chat" capability which I've used before to get answers. You sometimes have to look for this support feature at a website.