It is important to check references as written references are generally not worth the paper they're written on. As expats prepare to leave they will often give glowing references, perhaps in order to soften the blow of withdrawing employment. It is better to call the previous employer and verify the facts. Another point to consider is that not all expatriates needs and attitudes are the same. If you would like a probation period in which you can see if the arrangement is going to work or not, make sure that it is understood.
Groundwork is important.
Groundwork - the foundations of a good working relationship are laid here. On the first day it is a good idea to have a notebook and go through points systematically. Make sure that these are repeated regularly during the first week, to ensure comprehension. Sometimes, especially if she has previously worked in an expatriate household, your new maid will want to do things in the manner she is used too. While this is acceptable in some instances it could be quite awkward in others.