(1) If, at any time

(a) during the last 4 weeks of maternity leave whether or not part of such leave is postponed under section 14B or section 14C and where, in accordance with section 14(4), an employee has, or is deemed under section 14B(3) to have, notified her employer, or caused her employer to be notified, of her intention to take additional maternity leave, or

(b) during the additional maternity leave whether or not such leave or part of it is postponed under section 14B,

an employee who is sick wishes to terminate the additional maternity leave, she may request in writing (or cause a written request to be submitted to) her employer to terminate the additional maternity leave.