Ninety days report – fined in the grace period?

Today my girlfriend went to Phuket immigration in Patong to do her ninety days report. She was there two days past the date on the slip and they told her that the computer says that she should be find 2000 thb, but the officer said they can help her by charging her only 1000 thb…
Wasnt there a 7 days grace period for late ninety reporting? Was my gf just taken advantage of on the island which is supposed to be the shining example of successful struggle against corruption.
If it is so then its the first time for us in six years of living in Thailand. In fact I had exactly the opposite experience in the same immigration office – once I didnt get fined despite being late more than 7 days.