Heh, let her be mad - just go about your general business as though nothing out of the ordinary has happened. She'll get over it sooner or later, especially if you keep on with setting each member of the family certain tasks and make them take responsibility for whether they're done or not. The whiteboard idea is a very good one, or even just a list on the fridge or something - my aunt had the list on the kitchen bench for myself and my cousins (3 teenage girls in the house all with a horrendous amount of activities to keep track of - calendars are a godsend) and barring extenuating circumstances like illness or injury it was up to us to sort ourselves out.