VT's case is similar to what you are looking at. It sounds as though she is doing what they will ask you to do more than one FTEworth. When your union rep speaks with them, make sure that job creep [not the supervisor] is an issue.

What they now call increased productivity is often thinly disguised "make one worker do what two used to do and let them be thankful that even have a job."

When Jack London discovered he was in that situation, he threw his coal shovel at his boss.