C.M.
You know, just like with any job, she should have a review once a year. If you are looking for ways to put it gently to her, just go out, find some new products, like maybe some dusting wipes, and just say " I noticed the other products were not working as well so I got these to help make your job easier" and explain what it was that you noticed (picture frame). Also you can recomend that she vaccum the kitchen floor before sweeping it. Making small suggestions is not a big deal. Just do it all at once so that it does not seem like you are harping every time she comes around. As for feeling bad for telling her what you want...Have you ever had a job where you did NOT recieve constructive critizism? It's all about the way you say it. After a year and a half, you have to realize that you have been just as faithful to her as she has been to you.