They sure are elusive, first decent picture I have managed to get of this species.
Raised both my specimens from 1/2" slings, great eaters and prolific webbers as you can see. Pretty good growth rates as well.
If I'm correct, I can see the spermatheracae under the microscope (4x magnification), and I do notice a "flap" when looking at the molt with the naked eye very closely.
So I'm assuming that this H. maculata juvenile is indeed a female.