babyboy, it depends. I think 3 persons at home should be enuf to help out with the caring of the baby. Is your mum or maid helping you to look after the baby at nite? If that's the case, i think a confinement lady is not really necessary.
post natal depression happens to most ppl, though not all have full-fledged depression. This is due to a mixture of hormonal changes, the external environment etc. So far from what i've heard, most women will get out of it from a few days to maybe 1 wk or so. And yes, support and encouragement is essential, the other members at home would have to watch out for symptoms like constant crying or suddenly the person's character change. Think the websites and gynaes would be able to advise better.
hope this helps