Can't login to account

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http://askubuntu.com – Thanks in advance for any help. Ubuntu 12.04 Up until recently my mother has been using the Guest Session when she logs on; now, the Guest Session will not login. When I try to login to it, it bounces me back to the login screen. I then tried to login on a Standard account (Alberta) which I made prior to not being able to login to Guest, and it turns out I cannot login - it gives the "Invalid Password" error. So then I tried to change her password from my own account (Rory) which is the master account. Under the Login Options where the Password option is, it says "Account disabled" and it w (HowTos)