If she were a friend (as opposed to an acquaintance or 'just' a neighbour) I wouldn't feel the need to judge or make a retort.
It may be that she was thinking about getting one herself, as has been said, or that she knows of someone who is looking for one and wondered if you had a recommendation. It may be that she thought you looked tired, and would benefit from help to keep your house to the standards you have set (which are clearly different from hers, but that's no reflection on either of you), or all sorts of possibilities.
I may have said 'why do you ask?', but I wouldn't assume that a friend was having a go at me, or that there was a need to take offence or wonder about an ulterior motive.