What was the point of even mentioning it? Since you know she does the housework at her house, you could have safely assumed that she would do it at your house as well. It would be weird of her to move into your house and stop doing the housework given that she is used to doing the housework.

If she had cleaners come in at her house and you wanted to change that and have her do the housework herself, that would have been a good topic for discussion. But as is, no.