It looks like they actually had the planned "multi-weapon" in the third person build. For those of you who don't know, the original idea was, ala Aliens, Amanda was to just tape and mash together weaponry and equipment into one weapon. That makes more sense, in a third person build, if we're talking mechanic wise. It's different than just carrying a bunch of weaponry, that'd be terribly generic looking. The one weapon that's left that refflects those concepts is the Nailgun.
But they decided to go and ditch that. I thought they didn't go through with it and just left it concept. Applying that to third person makes a lot more sense, but that translates, rather unwell in first person. It also looks like she was carrying the cut "SMG", maybe? There's whole load of cut material for this game.