To say nothing of the fact that it is perfectly possibly (likely, even) that a thirteen-year-old can be coerced, frightened, manipulated, and misled into having an abortion. I'd say it is going too far in some of these cases to treat these girls as accessories to murder.
I think Planned Parenthood should be held to the same standard as any other doctor, hospital or health agency and require parental consent prior to any visit or treatment of a minor.
As a parent, I have always been required to sign for consent for even noninvasive procedures such as x-rays, dental exams, etc ...