Presentation and the maturity of the baby at this stage of gestational period is quite good and normal as per ultrasound
But single loop of umbilical cord
around fetal neck may cause asphyxia
or respiratory problem in some percentage of vaginal delivery
. Though it is reversible in most of the cases.
Consult with your obstetrician regarding this to make a decision for conducting mode of delivery.
Wish her good health & successful motherhood.