Upvote:9
I am surprised that she was not advised of the proper procedures when making her arrangements (it is quite easy to check visa requirements from http://www.esteri.it/visti/home_eng.asp ), but what is done is done.
Working without a visa is a serious offense in any country. Overstaying in any country is also a serious offense. As you can imagine, entering a country with the intent to work without a visa, and then overstaying not by 40 hours, but by 40 days, will be treated very seriously.
When she goes to exit control at the airport, her passport will be scanned. Entries into and out of the Schengen area are recorded in the Schengen Information System, and if the overstay is flagged, she will be taken aside for an interrogation as to her activities in Italy.
The immigration officer has great deal of discretion concerning penalties for the overstay, and may
Being an illegal worker may carry additional criminal penalties.
Even if she manages to get through exit control, the overstay may cause problems on any subsequent trips, at least until the expiration of the passport.