Yuki,
I tink she is those "Eat soft dun eat Hard" type, like my E. Have u tried taking away a fav toy from her if she do wrong things? Or reward her when she does something correctly? It works for my E. If he is up to some mischief (which happens everyday

), like scribbling on the table or wall, I will threaten to take away his fav trains...one by one. And make him repeat after me that he will not do it again. Or if that doesnt work n he kicks a big fuss, sometimes I bopian will use reward system. Usually the reward is vitamins gummy bears.

Then he will guai guai do watever I tell him to....like clean up his mess n pack his toys etc. Then when he calms down, I will slowly explain to him what he did wrong n why mummy scold him. But his memory is so short....after a while, he forgets n does it again. Then I got to reinforce again n again. Sometimes I feel so naggy nowadays. Really like huang lian po.
Wat my close fren does is make her boy stand at naughty corner n let him fuss n cry for all he wants. Even if he cries n whines for half an hour or more, she will not give in. Only then, her boy knows who is the Alpha at home. Now her kid is abt 4+ yrs old. He is more ting hua. So I guess it boils down to the character of each child n wat is the suitable approach to use. Its really not easy being parents.
RE: Toilet train
E is already off diapers in the day. Even for afternn naps, I dun put on for him already. Only wears it to sleep at night now.
But a few weeks back....E kept having misses and pooed in his pants. And I kept reminding him "Want to poo poo, must hold until u reach the toilet ok". Then I realised whenever he pooed in the pants, he will practically use 2 hands and hold his poo tightly and ran to the toilet. He did this a few times n I was puzzled. Cos before that he could run to the toilet in time. Put on his potty seat n pull down his pants n seat to poo.
Then I realised silly me told him must "HOLD" until he reach the toilet. He tot I told him its ok to poo in the pants n HOLD the poo until he reach the toilet! FAINTZ!
So now, I say must CONTROL until he seats on his potty or toilet seat, then can poo. And u can see his face all cringed up trying to hold his poo. Sometimes he will clenched his fist n tell me "mummy I controlling" Haha! Sometimes really feel like bursting out laughing. Really must be very careful with our selection of words cos they take it word for word now.