One of my cousins was born 6.5 months after aunt & uncle were married. Aunt always maintained he was “premature.” I prefer to think he had a front row seat at his parents’ wedding. 8~D
My grandfather used to say that the first child can come most any time, but the others come quite regular . . .
That said, if it is a Christian school and has stated so and hired her with that criteria, they have a right to invoke Christian morals. Non-Christians are not held to the same standard, nor are non-Christian schools.
Expecting Christian moral standards from a non-Christian is rather like trying to teach a cow to fly.