Sorry to hear you've got friend difficulties atm. I've only one thing to add to the ladies' advice above.... perhaps tell her that you're grateful for her friendship, and since she has BTDT tell her you'll probably have some questions for her as you go along. Explain your birth choice/plan, and you could even go so far as to say if, medically, you do need to progress down the path of a C/S she'll be first on your list to call for recovery tips etc.

She may just be *very* excited for you and in her excitement is forcing, what she believes, is an ideal approach on you. It sounds like she really enjoyed her whole pregnancy/birth experience with the OB and wants you to live the same dream, so to speak. I think she probably just doesn't *get* how keen you are on going with a midwife and vaginal birth.

But don't sit on it if it's becoming the pimple on the butt of your relationship. If she's a good friend, work it out before it starts to fester.