Depends on the 15 year old. And her parents. And nobody's talking about not allowing pregnant 15 year old girls to have abortions at all, we're just talking about whether the parents have a right to be notified and give permission for it to happen first. Now, it may be that some parents won't give permission, which is their right, which will mean the 15 year old will have to carry the baby to term, but there are plenty of options that young mothers have other than abortion, including adoption and being a good parent, that need to be discussed and considered with the parents involvement.
Clearly the child is incompetent to make such choices, since she has already demonstrated a lack of good judgment regarding sexual activity.
For most pregnant 15 year olds there is only one option the tax payer looks after this kid for the rest of their lives (something I suspect Seth would not be happy with). Very few 15 year olds are going to go through a pregnancy and voluntary give up a child
As for parental rights guess what when it comes to children that have zip, none zero over children they have responsibilities which is a very different matter