Screen sharing with windows 8.1 - observe windows screen on mac
A couple of options come to mind. You can try both and see which works best for you.

1) you can install VNC for Windows (there are several versions) on her machine

Most are free and should work with the OSX vnc client application. I haven't use it so I can't say more. As long as they on the same network you should not have any problems. Over the internet, things get complicated...

2) install a free (for personal use) application like TeamViewer.

I prefer Teamviewer as it is simpler and it will work from anywhere in the world with a semi decent connection. There are several other applications like this out there but I've used it for years and I've come to trust it.

The other good thing about TeamViewer is that once her machine has it installed (and password protect it), it will get an numeric ID that should not change. Open an account with TeamViewer.com and save her ID there. Then anywhere in the world you can find her machine and share her screen. Neat no?



Hope that helped.