Just imagine how they would have reacted had Mrs Petrie been a Muslim offering to pray to Allah
Those whom the gods would destroy, they first make mad.
Exactly. Mrs Petrie signed and agreed to the code of conduct. It is there to protect all parties. Her job is not to provide religious comfort in any shape or form. All she had to do was offer up a prayer in private. The code of conduct still stands and Mrs Petrie would still be in breach if she continued.
http://www.secularism.org.uk/106408.html