She could have won the nomination, but instead she hit Gov Perry with a kamikaze attack, and ended all hopes.
I should not have said perfect....what she did with Perry was desperate. However, she is way more put together and understands immigration, terror, and Obamacare more than most and for goodness sake WAY MORE than Romney.
That is not what ended it. She moved away from her focus on the economy and tried redefining herself as a social conservative. People lost interest in her at this point. The buzz she generated was solely due to her position on the economy. Her campaign staff blew it by taking the focus away from the economy.