An employee, irrespective of his length of service, is entitled to the following statutory holidays :
the first day of January
Lunar New Year's Day
the second day of Lunar New Year
the third day of Lunar New Year
Ching Ming Festival
Labour Day, being the first day of May
Tuen Ng Festival
Hong Kong Special Administrative Region Establishment Day, being the first day of July
the day following the Chinese Mid-Autumn Festival
Chung Yeung Festival
National Day, being the first day of October
Chinese Winter Solstice Festival or Christmas Day (at the option of the employer)
Clause 6 of I.D.407(i.e. Employment Contract) states that "The Helper shall be entitled to all rest days, statutory holidays, and paid annual leave as specified in the Employment Ordinance, Chapter 57."
Based on the Employment Contract and the Employment Ordinance, they are entitled to 12 days statutory holidays only (not public holidays). Easter Holidays are Public Holidays only and are not statutory holidays. They are not entitled to the Easter Holidays. If your maid wants to be off on these days, you can deduct from her annual leave.
If your maid insists on being off on Easter Holidays, you can treat these Easter Holidays as compensation day-off (it is because you do not follow the Employment Ordinance).