I'd say pullet, I have a RIR cockerel the same age and his comb is massive and both it and his wattles are pretty red
pic from a couple weeks ago(I think they're 5 or 6 weeks here, they'll be 8 weeks this Friday) and his comb is bigger now I think, but you can see how much of a comb he's got, and his little wattles(also more prominent now) compared to your girl
(On the plus side, I can show my mom the pic of your RIR pullet to show her how a RIR pullet does NOT look like our RIR... she's in denial he's a roo)