i also not 100% sure either, unless u got a closer look at if face, especaily the mouth&"chest"area. but i would also say from what i see that it is female as well.
as you can see here clearly the differences. easiest way i know of to tell. gl.
Mosdefenate, yes on gill area. those pics are my JD pair. only 2 other ways i know of is venting, and if it lays eggs sometimes female CA/SA cichlids will "drop" eggs as if they were spawing by themselves.