Do Per-Diem employees have equal rights to Full-Time employees?

Question Details: A Per-Diem employee, who was with the company for over 15 years, was fired because she took a few months of vacation, which was approved by the scheduling team. They fired her without prior warning or reprimanding. Then they sent her letters congratulating her on her retirement. Now the company has told her Unemployment office that she was never fired but that she quit and now she might even lose unemployment benefits. Does she have any rights? Important Notice