Maybe you could ask her why her self esteem is so low she feels the need to "compete" with you about your birth choices!
Maybe she is trying to compensate for her own feelings by belittling you. Not very 'sisterly' but I guess I'm trying to see what might be causing her to act like this...

What kind of birth experience has your sister had? she says you haven't tried to 'push a baby out' - has she had a CS?

I've had both & guess what - there IS no easy way out!

you do what you want hun, birth your way & pfft to her. It's YOUR childs birth, try not to let her comments get you down.

Mel - I am looking forward to seeing your VBA2C BA!