My friend has been working at a car lot for the past 2 1/2 yrs and today she was given a letter along with her paycheck that hourly employees (she's the only one) not meeting their 60 hrs in a pay period of two weeks will then result in garnishing of their medical benefits. She knew from a previous experience that she would be getting paid 8 full hours on holidays. Yet, today when she received her paycheck, they only paid her 4 hrs for Thanksgiving. She was under the impression she was going to be paid 8 full hrs for this holiday, but her employer never told her that she was only going to be paid for 4 hrs. Can an employer change how many hours a person gets paid on a holiday even though it was evident she was getting paid 8 hrs on previous holidays?

Yes, they can. An employer has no legal obligation to provide ANY holiday pay; nor do holiday, vacation, personal, or other hours paid for time not worked count towards overtime.