User blog comment:B214/Volume 17 spoilers./@comment-187.209.0.247-20140306224029/@comment-24468758-20140312064339

She is happily married and has neither the intention nor the feelings for moving in. She sees Issei as her brother-in-law and cares deeply for him, no more no less.

Regarding the maid issue: in my opinion she is since she deliberately chose to work as a maid and doesn't that already make her one?