May I suggest your daughter contacts TAMBA if she has not already been directed to their website...
http://www.tamba.org.uk/.... there she will get great support and up to date information about twin pregnancy and birth.
As a midwife and a mum I always hesitate to get involved in threads of this type as any advice I can give is really very generalised and not tailored to your daughters individual circumstances which is what she really needs. However I can always be pm'd if there is anything specific I can help her with if she would like that. She still has the majority of her pregnancy to go yet, and a lot of the options around birth decisions often cannot be made until later in pregnancy when the type of twins she has is better known and their presentations.
However, I must add that my very first birth as a qualified midwife way back in 1987 was a beautiful spontaneous twin birth which I have never forgotten.....they are a bit different from singletons but every birth is different and it is important to reassure her that what has happened to her friends and their pattern of birth is likely to be very different from her own.