Hi please help me solve a mystery. My sister is a masters student working in a research laboratory. Last week her supervisor without warning informed everyone in the lab that all the locks on the lab's doors will be changed and she lost her 24hr access. Then both her supervisor and postdoc took a week's holiday and told her not to come into the lab as lone working was not safe for a student. She was instructed to write up her experiments In the mean time. She's worried that she's being kept out of the loop and something is going on, but noone has said anything. Would anyone have experience with this kind of situation so I could give her some good advice? Any help appreciated!