Windows does have such features built in. If you check under the accessibility section of the Control Panel you will see that there are options built in that will allow someone who is blind be able to still use a PC cause it will read off the actions that are being performed. I am not sure how well such features work, as I have not personally used them.
If she is looking for something more than that, I will have to do some more research on the subject matter. I just thought of the accessibility section right away cause I see it can be accessed right on the login screen of Windows 7. It is the gear looking thing on the lower left corner. You can enable what options you want.