Ah, the 9th amendment. What a beautiful yet wicked creature it is.
You're right about Norma McCorvey though. She had little/nothing to do with the case. However, that has 0 to do with the court's ruling. If not Norma McCorvey, it would have been someone else. If not Roe v. Wade, Planned Parenthood v. Casey. Hell, Griswold v. Connecticut should have given us our first insight that the USSC would always hold the "privacy" right.
Oh yes, by the way, if you ever have about an hour to waste, I recommend the two best USSC opinions ever wrote: Griswold v. Connecticut (the majority opinion by Chief Justice Warren) and Marbury v. Madison (majority opinion by Chief Justice James Marshall). It's pretty humorous how these guys can take the constitution and pretty much do with it what they wish.
And also, the majority opinion in the Roe v. Wade case (I think it was Blackmun that wrote it--might be wrong) is one of the worst prepared I've read anywhere. In my opinion it was just a bunch of hellabulu put down on a piece of paper that was strictly more opinion than constitutional fact. Rehnquist was in the dissent of that decision, and he punched holes all through the arguments. IMO, if the opinion in the Roe v. Wade case would have been written better we might now have had the same typical abortion cases we have virtually every day now.