I just think its a corupted account of some sort.
If you can access her documents from C:\Documents and settings\*account name*, grab these off and then put them somewhere safe. (This will make sure all her settings and documents are saved)
Now go to Start, Control Panel, User Accounts. Click her account and on the list select to delete it.
Now just create a new account with administrator rights so she has full access.
Finally drag her files back from where you saved them, back into her documents and settings and you are set. I would now restart