To me it sounds more like she doesn't really understand how much this will cost and she wants to understand that. From having done ghostwriting, I know how people get about wanting some kind of hard price for the whole thing instead of understanding that a project changes. What about showing her some websites you've done (or even haven't done) and giving her some well padded prices on those? And say out front that is with no additional changes, that any changes would be extra and would cost a lot. That way she would have an idea. Also, I would be real careful about getting everything spelled out completely in a contract with her.