I understood the article to be saying that, as a matter of policy RCOG advises CS for breech presentations, hence hospital recommending it, but that they were also happy with a vaginal birth. So she's not ignoring medical advice, just changing the setting for one of the options the hospital was OK with.
Personally, I would prefer to avoid a CS but would want to be in a hospital (ideally a home-from-home type unit) because if something went wrong whilst the head is still in the mother's body, outcomes can be very poor, and every minute of transfer time can really matter.