DD constantly refuses to do what I ask. She either completely ignores me or says 'no'. I realise this is quite common, but I need some advice on what is the best way to handle it. At the moment, because I also have my hands full with a 7mo and get a bit stressed, I spend a lot of time telling her off, which is making everyone miserable (including me).
I do feel that, once I've asked her to do something, I shouldn't give in and allow her to ignore me, as I don't want to teach her that I can be ignored. Generally the stuff I ask her to do is necessary or important. Threats (e.g. no CBeebies later if you don't do as you're told) sometimes work, but more often she doesn't seem to register them, and just repeats them back to me in a nonchalant way. Time out doesn't seem to work that well as a deterrent, and anyway, it's not always feasible.
So, how can I be firm with her and get her to comply without feeling like a grumpy old hag?