Discipline wise I tell her no and naughty and tap her hand (gently) when she does something she shouldn't. Like you it seems to have no effect and she constantly tests the boundaries. She has a look when I tell her off. The 'I know you're going to tell me off, but I'm going to do it anyway' look. After I've told her, she will look at me kind of like she's peering over a pair a glasses.
It's definitely the 1 and 1/2s rather than the terrible twos!!
IIRC J only had a about a week of the terrible twos. A has been like this for a few months.
I can agree with you there MamaD! I definitely spend the majority of my day saying no. It's the only time I'm glad I decided to go back to work!!
It was my birthday yesterday and H lined up all my cards on the window sill and within 10 seconds, they were all on the floor around A who was sat in the middle of them.