I am not so sure I would want to sponsor a live out to be honest. As a maids visa, you are completely responsible for her. Also, if she works somewhere else and is caught you will also carry a very hefty fine. If you are comfortable with this arrangement best of luck.

You have to first have a visa available for her. Your husband needs to apply for a housemaids visa under her specific nationality. Immigration will ask for his ID card, a letter from his work, your marriage certificate and they may also ask you for your rental contract as well as the water and electricity bill of your house (this may happen to confirm your residence). They may also ask for a letter from your work as a lot of the time they are hesitant to give a maids visa if the woman is at home and not working (happened with us but doesnt happen with all).

Once this is approved she will have to leave the country and re-enter on the new visa.

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"Diplomacy is the art of saying 'Nice doggie' until you can find a rock - Will Rogers"