We do not know if she did pose a threat, unless she was going to damage someone's cute lil' I 🖤 MYSELF SO MUCH desk mug by hurling her backpack at it orrrrrrrrrrrrrr maybe she was gonna go all Vin Diesel-like all over the place and break necks like it was Whac-a-mole but with styrofoam moles stuck in place as she malleted them with her fierce anti-hero trope chop like a scene out of the next Riddick flick.
There were people successfully entering the same chamber, looking for hidden Congress members to zip-tie them, building a platform to hang them, relieving themselves to remind them they sat their desk, stealing things, chasing Capital Police up stairs and down hallways, pummeling and assaulting officers for hours to the point that many have committed suicide since, and Byrd and the rest of them seemed to have gotten awful sucky with their aim after that, some even posing for selfies after opening doors for them. Was that it? If Ashli simply allowed Byrd to usher her in he would not have killed her and only her?
Potter, meanwhile, had a spotless record, unlike the 20yo criminal who was fleeing arrest, which given the looks of the automobile he was driving without a license and his nifty sneakers and posh designer hoodrat outfit, didn't even have the broken 30something desperate druggie excuse for his jr life of crime. Just some stupid punk who wanted to be a thug cuz Tupac wuz gangsta - in his CDs, anyways.