I Vote for getting a lawyer
And if she has'nt lost her job yet she needs to start looking for a new one because it sounds like they r looking to hang her and what little i know (GF is H R person) unless she signed a paper they cant force her to take any type of lie detector and right now her employeer cant talk about her work file just except her attendance and job quality but IF (IF) they get a theft on her then they can talk about it!!