Hi strucel,
I'm suspecting that her authentication credentials may have changed.
She might've changed her domain password recently, perhaps?
Have her try open a DOS prompt, and run:
qblogin
which will ask for her password twice. After the password being
accepted, it should print "INFO: updated password."
Then try submitting a command-line job:
qbsub dir
This should submit a "dir" command to the farm.
If that job submits okay, she should be able to submit a 3dsmax job too.