But it isn't abnormal behaviour of someone who is used to getting their own way, and has a taste for manipulation and power. She won't be the first NT 12yo behaving like this, and she most definitely won't be the last.
Different children respond to different forms of parenting; there is most always a method that will be successful without sucking the spirit out of a child. The OP's sounds like she needs very firm, but fair, boundaries, and consequences that are apt and always followed through.
For example, and this is a true story about DD2. She went, age 6, to a fair with her best friend. I overheard them talking, and made it very clear to her that she was not, under any circumstances, to come home with a bloody goldfish.
Guess what, she rolled home later that evening with not one, but two goldfish in a bag. I told her I was extremely disappointed with her, and first thing the next morning I took her to the bank, emptied out her savings account, took her to the pet shop and spent every damn penny she had on a lovely tank and bits for the fish.
Yes, she kept the fish. But she had to feed and clean them (under close supervision) for years, she lost every precious penny she had saved (this is what hurt her the most, she was incredibly into saving her money, and was saving up for a big Betty Spaghetti thing), and the fish lived in the kitchen, and not in her bedroom as she wanted.
There's a knack to fitting the punishment to the crime, sometimes you have to be incredibly inventive and strong, but consequences like that are excellent for teaching kids they can't always get/do what they want.