Our house mother was pretty hands-off. She kept on top of basic house maintenance and was the person who would call companies promptly for whatever problem that needed to be fixed. She also frequently ate with us during formal dinners twice a week and did little things like late night snacks during finals week. She basically just enforced the rules (especially the no guys in bedrooms, guys out of the house by 2 AM rules) and made sure we didn't do anything too wild.
One thing I did really like about her was that we jokingly asked her one night to pick us up from the bar (which is easily within walking distance) if it was raining or we were too drunk and didn't feel like walking. She readily agreed, and we never took her up on it, but I really do think she would've done that for us even though it would mean going out at 3 AM to get us.