Well, there's never any point in kicking stuff around when you can find out the facts that are relevant to that discussion. Turns out that the Alaskan Supreme Court overturned a 10 year old parental consent law in November 2007. Palin called this decision "outrageous" and vowed to support a constitutional amendment that would re-instate parental consent laws.

So Bristol could have obtained an abortion without her consent, although her mother is working to end that option for teens. IF she could have come up with the money. Abortions aren't cheap. And then, as you said, she'd have had to be an idiot or angry at her mother, and she doesn't seem to have been.