I would like to say female, since she has more of a rounded belly than most males.
Look at the difference in shape between these two pictures. Both from the same spawn, 3 months old. You will probably have to wait to know for sure, as I have had some females become males xD And vice versa! Not the length of the anal fin, and thickness of the ventrals.
Usual ways to check: Beard, egg spot, ventral length, fin length (anal fin tends to be a lot longer, then the caudal, then the dorsal), body shape. Flaring won't be a good one to use, since all my females and males flare.