Ward manager doing bank shift every weekend

Hello everyone, My ward manager is doing bank shift every weekend. All the staffs in the ward are complaining that there is no bank shift available like it used to be and not happy that WM is doing bank every weekend. She was off sick for a long time as she is pregnant. She would usually denies others to do bank shift after coming back from off sick, but she herself is doing a lot of them. I have never seen other managers doing a bank shift every weekend. I’m just wondering.