It was a task where all housemates were going to get a gain from BB if they able to complete the task. It was housemates v/s BB, not between any two teams of housemates. And the task was real tough too, holding a rope for 24 hours in standing position is not a joke. Now in this scenario Priya could be a wise sanchalak if she was not over strict and do not take into account the very minor issues. I'm not saying that she should be sanchalak as Suyyash was in bowl holding task that Aman is telling him that Kish commit a mistake, and Kish herself admitted that but still he disregarded it on the grounds that he haven't seen it himself. But she could easily ignore what Rish did as he never left the rope that cause that sack to fell. And in case of Roch, if she is having a word with that person who's going to cut her rope then just be quiet, let her do it, if he did what he is doing then its ok but if she's able to convince him to cut it only few inches lower due to which she is able to hold the rope few more hours then it would help all the housemates. Even though Roch's reacted over the top and her retort was very loud and rude but all housemates including Rish seem to agree with her on her standpoint.
The real intelligence is when to speak and when not, and Priya lacks it big time.