That also happened to my kids before. I hire a new maid in the end of Feb. Be serious my kids won't go along with her at all. She is pretty and good smiling face. Because of this point, I also want to change another maid same as you.
But what if I hire another one and they not go along with her again?????!!!!!.
Therefore I do something between maid and kids.
1) I bought home some candies and sometimes ice-cream. I told them because you are good, therefore Sally-the maid's name give you as a present etc.
2) Give them more time to stay together but without you.
3) Tell your maid not to do housewhole all the time, spend more time with him or her. Watch Tv together, do some drawing etc.
4) Give them some money and let them to go to Mc Donald together and spend some good time.
And now my kids going very good with the maid. They will share the happiness together.
In this case, if I were you I will change the maid right away.
But make sure, next time when you hire a maid, language is a very important concern. And also make sure the maid love kids, at lease they have patient. I think is better to hire somebody who already a MOTHER.