Ok well it sounds like her password has changed or something so will try fix that
first way of trying to change password would be log in as guest
Go start, type cmd in the search dialog box, when it comes up right click on cmd and go run as administrator. (if this does not work just try running as user)
in the cmd window type
net user
this should show all the user accounts. now type
net user administrator *
(you can change "administrator" with the account name you are attempting to change)
Now it should say enter new password. So enter a new password.
If this does not work then retype "net user administrator *" and when it asks for a password you just press enter twice to reset the password to nothing.
Now if the password is set to nothing you should be able to go to control panel, users and change the administrator account password because it should not ask for a password to change the password because there is no password and if it does ask for a password then just leave it blank and enter new password.
if for some reason you was able to reset the password but can't enter a new password through control panel then i suggest you restart the computer and try logging into the computer as administrator without entering a password.
That is the first method to attempt, there are other methods that work but this is the first method i recommend trying
if this doesn't work will try my other method
good luck
