What should we do to keep the Filipino maid firm in her religion after she converts to Islam, what should we advise her, and what is the best way to convey Islam to her?

The methodology of the Prophet, peace and blessings be upon him, must be followed when inviting people to Islam, by observing the following:

Clarifying the fundamentals of faith and the pillars of Islam in a clear and simplified manner. Gradualism in matters of lawful and unlawful (halal and haram), as it is more conducive to steadfastness in religion. Translating the meanings, ethics, and manners of Islam through interaction with them. Emphasizing the doctrine of loyalty to believers and disavowal of disbelievers, and choosing righteous companionship for steadfastness and avoiding deviation.