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Sorry, I wasn't saying that she should use a AR. Just another reason why some will only use a PCC and pistol, to carry the same ammo. Like the P90 and FN FiveSeven pistol.
But after reading this thread, I believe she would be better off with a PCC type. I do feel that the PCC's would be excellent at close range for men or women. Not just because of the extra velocity, but also because the pistol caliber rounds would have a better knock down power. Like some would use a 6.8SPC for the same reason at close range. It may not have the same velocity as 5.56, but unless their wearing body armor, its going to hurt.
On top of using the CX4, she could also have a Beretta pistol in the same caliber and use the same round and magazines. Can you imagine, using the same magazines in your pistol and rifle?

Just throwing this out there, some people like the idea of carrying a singular type round for both guns. It was done during the cowboy days too, lever action rifles and revolver pistols.
Personally I'd still carry my M4 in 5.56 and XD service in 9mm.