I have noticed that there are some posters that have raised questions, here are some (possible) answers
Batterred women can seek shelter, and not worry about their immigration status. This is to prevent the victims from NOT seeking help.
It is a violation of federal law to employ or house, shelter, or conceal illegal immigrants. regardless of state of municipal laws giving them "sancuary"
If the OP took in the family, the net effect could be, in some cases, that she would be exposing herself to criminal charges, and/or civil penalties.
The OP does not know if the houskeeper is a "battered" victim, it could be a story to find her lodging for her and her children, presumably with paying for it, for an indefinate period while she continues to clean houses.
If the OP did take them in, and the housekeeper is a victim, the husband could track her, and if he uses violence on one women, he would not hesitate to use it on another. The physical danger alone is a warning! And you would end up having to call the police!
The horror of people fleeing a tyrant for their lives has NOTHING to do with illegal immigrants coming here to work. TWO different situations, and frequently people TRY and use this excuse when arguing in favor of illegal immigrants. Please do no cheapen the memory of millions killed, to support your views on why illegal immigrants can ignore our laws and do as they please.