All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
It is the specialist and trustworthy doctors who make decision in such matters. In general, they do not advise a means that would greatly harm a woman at the time of delivery. Therefore, if this female doctor is experienced and trustworthy, and she advised that woman to have a normal delivery, then it is permissible for her to act upon her advice.
The fact that there is such a percentage of risk does not have any effect on the ruling. The preponderant benefit takes dominance over a minor potential disadvantage.
Indeed, it is very rare that doctors carry out a surgical operation without any percentage of risk.
Allaah Knows best.