Saddle feathers on boys are going to be very thin edged and sword like. On girls, they're round, regardless of breed. Hackles, for whatever reason, tend to be pointier in some breeds and individuals than others. A rooster will still have sharper looking hackles than a hen, but "pointy" can be hard to judge in especially young birds.
How dark are the combs and wattles on your other pullets? This one might just be coming into lay and therefore darker for that reason. The feather pattern is certainly dark enough to look like a pullet to me, but I've only raised one barred bird.