i think you should cut the entire branch.....it is a hermie.....it may appear to the other plants as well later in flowering.....in my first grow i faced the same problem as well, during the end my ladies went hermies (do not know exaclty when) giving me a few seeds as well, the plants grew from feminised seeds.....since you've got only 4 ladies, then you will be able to look even carefully for flowers.....if you manage to pick all the male flowers out you will be ok...for now, cut the branch....

NGOS