Experience certificates hold the information of start date and leaving date of employees. Maternity leave/ any entitled leave benefits cannot be discounted from employee's length of service.
The employee is availing the maternity benefit because she's still an employee of your company. Hence, you can provide the experience certificate from the date she started to work till her last working day.
If other senior colleagues here handled this situation differently, please share your thoughts.
19th January 2018 From India, Bengaluru