This is the case:

Danielle is the office administrator of the primary side of a large school in the city. She is the only female staff member at the management level. The Principal (who is significantly older than her) often refers to her as the "office mum", although no males at the management level are ever referred to as "office dads".

He expects Danielle to handle staff birthdays and asks her to organise coffee for him and the Deputy Principal each morning.

Danielle is becoming frustrated with these requests and the "office mum" label. She tells the Principal of her concerns, and he responds by telling her that she is "overly sensitive".

What laws would affect if the principal decides to continue calling the office mum? And what kind of discrimination would that be? Gender employment discrimination?