Like i said, I work with Filipinos - my colleague on a work do was talking about her maid, who she'd hired from her home island (where she grows sugar-cane - she is a finance director herself). She had to teach the girl how to use a normal toilet, because on the island, they just disappear round the corner and wee/defecate on the beach.
I don't think people quite understand how different live is on rural islands vs. say Manila (which is a metropolis). How sleeping on an airbed in the kitchen is totally fine for the salary vs. what it would be at home (sand floor in a reed hut)
If you haven't actually met people, talked to them, lived with them, I don't think you can quite understand, and it's very patronising.
Yes, treat fairly, but understand that if you tipped (say £100) then you are placing an obligation on her in return. In my company, the Filipino staff get Christmas boxes of oil and rice to take home to their families, and they have good conditions compared to other local companies.
This all smacks of white saviour. Don't be a jerk, treat her fairly, but don't patronise.