Sorry forgot to say, as others have, that the period is critical as well as the social standing of the employing family - the latter would especially affect the meaning of 'domestic servant'. Many upwardly mobile middle classes employed a 'maid of all work' as a status symbol if they could afford it, who basically did everything, cleaning, cooking, ironing etc etc. In more wealthy families the duties of each servant was more clearly defined.
Cheers
Biker