That being said, I think the Archie comics have not so much pushed her out of the spotlight (which they have decidedly NOT done and if anything have given her a LOT MORE screen time than before) but have decidedly downgraded her ability and significance.
I point that she was owned, repeatedly, by her Anti-, Rosey proved to be the superior smashing machine even breaking Amy's hammer and forcing her into pathetic and cowardly retreat each time. This is non-sensical given that Rosey doesn't have any sense of focus or control, and is ultimately just a child with a handgun so to speak.
On the surface you might think that since Amy's primary source of strength is her emotions, that Rosey, who is completely ruled by her base impulses, would make the superior fighter, but that's forgetting that Amy has been taught combat talents that Rosey doesn't have. Amy was shown to be mentored by Julie-Su in combat, which Rosey decidedly was not (thus Amy having combat skills Rosey did not), putting that aside I somehow doubt Rosey's combat experience matches up to Amy's.
And even putting EVERYTHING aside, one of the original base rules of the Zone Vs. was that you can't beat your counter part on equal footing, and both Roses were upgraded by the ring of acorns, even if it left Rosey insane (and basically acts how Amy-bashers think Prime-Amy acts like).
I might just be acting paranoid, but my gut feeling keeps telling me that someone with a personal dislike of the character was part of the writing or editing team for these particular scenes. Maybe I'm wrong, maybe I'm right, but that is my opinion on the matter.