I have a new employee in my team, she is a devout Muslim. She's been with us since January and there were no issues so far, she's getting along well with everyone and her performance was fine. I sent her an email on Friday afternoon to say that our client has now (finally) prepared all necessary documents and that she should go there and go over everything with them one day next week. She wrote me back today that she can't do that because only men work in the department and she can't spend the day alone with strange men (because of her religion).
AIBU to insist that she does her job and goes there or would that be religious discrimination? She shares an office with a male colleague and has never complained about it. She's the first devout Muslim I've ever had on my team and I honestly have no experience at all with such issues. She's the only one who has the necessary experience and isn't already scheduled elsewhere.