My daughter is 20 months old and while she's been defiant before, never in an unsafe situation until now. She has recently started standing on the couch, then when I say "sit down" she laughs and dives on her belly, which could obviously see her dive off onto the floorboards! We're very consistent, saying sit down and if we get to her before she dives, we sit her down, get on her level and say "sit down, good girl". If she keeps doing it, we sit her on the floor. Usually if she's doing something "naughty" to get attention, I ignore her until she stops the bad behaviour and then give her attention once she's being good. But I can't ignore this because she's going to hurt herself :-( any tips?