軒靚媽媽 : I agree with cmsm. The new one may not be better than the old one. It's by chance & luck!
I also changed the maids three times per year. Whenever I change any maid, I can see the most impact is on my son who is taken care by the maid. On any change of care takers, he cannot tell how he felt as he is only 3 yrs old. But, I can feel he is trying to adopt to the new care takers. It is the hard time for him as mummy lost temper to the maid..... He is under pressure, but he has no choice.
I have an experience. If I speak loudly to my maid, my son observe this situation, and his temper become bad around that time. Talk to the maid in the room, so your children will not involve.
If your son can talk, u can ask him whether he likes this maid & why.
I have a similar problem, my son is also 3, he got sick every 2 weeks start from my maid arrived, which is Jan 2006 till now. But we change this month to bath my son and take him to sleep by ourselves, the situation is much better, no more cough during nighttime and morning. You can try first better than fired her.
I also tried to help my son before when I change the maid. To make less changes and less impact to him, it's better to take care our little prince by ourselves under some uncertainties (say if you are wondering whether the maid is trustworthy).
軒靚媽媽, it seems that your maid is not so bad as long as you see she is loving your son.