I would imagine it would be just a matter of linking your helpers nation to the French Immigration departments usual tourist visa application criteria.
I am assuming that your helper is either Indonesian or a Philippines national, which are 2 countries that are required to apply for a short term visa. Not indifferent to HK's immigration policy, but I assume France will grant a 90 day short term visa inline with both your passage free passports, US and Australian citizens get 90 days automatically.
Might be a good idea to visit the French consulate with your helper and while filling out the application, providing supporting/ legitimate documentation that states that she is your employee.
I doubt it will be a problem unless France has a special restriction on how many days an Indo/Phils citizen can stay there, less than the typical 90 days issued etc ..