Rainbow, i agree with the other girls that your SIL needs to talk to a proffesional about her fears etc before she drives herself and you crazy

I have a friend who was adament she wanted a c-section for her first birth, no ob would even entertain the idea without a medical reason behind it, she went on to have a drug free vaginal delivery and it so proud of herself

I hope your SIL keeps her appointment, and you might find that once she has been to a couple of antenatal appointments she might change her mind