Using DigiRev's method of VNC, no, but you have to walk her through downloading the application, setting it up, and forwarding the port on the router if she has one.

With logmein.com, all you have to do is pretty much email her the setup file and her computer is added to your account. However, you do need to know her windows username/password which isn't that bad.

You could try this: https://www.crossloop.com/landing.htm
Which uses VNC and is a LOT more user friendly as the only thing you need to know is the key that it generates or that they type in.