Wah! I'll fry her immediately. You need to tell your mum she got paid to do her job and in fact she's much better to work in HK then somewhere else. Food will be provided to them adn they have holidays, etc!
They are not HK ppl and rules are needed for them otherwise, your mum is the real person who treated them badly by teaching them to be sooo lazy and useless. No one will ever employed them again.