Lack of internal communication; and an honest mistake, does not warrant being shouted at.
What exactly is an honest mistake?
I hate that term.
A dishonest mistake surely isn't a mistake but is deliberate.
There is no such thing as an homest mistake, it is a mistake.
In this case, she made a mistake, but in moving rooms, she has made the mistake. The big room was booked for its features, she moved it without checking. Is her job to organise these rooms? If so moving people around without actually speaking to the person who booked her is neglecting her duties.
She made the error.
The manager is not happy.
Now what, she is unhappy she was shouted at?
Great. no one is hapoy when they are shouted at.
Doesn't fix either issue.