She does not have to give you any notice at all if she intends to return to work at the end of her maternity leave. If she intends to return before that, she should now give you at least eight weeks' notice. If she fails to give adequate notice, you can postpone her return to give yourselves eight weeks' notice. You cannot postpone her return to a date later than the end of her ordinary or additional maternity leave, except with her agreement.
