I've got a save next to her. I've confirmed that nothing is changing her in FO3Edit (other than MMM adding its variation script). She's in the RaiderFaction and RaiderFriendFaction, but neither of those seem to have a built in hostility to PlayerFaction (actually, I don't see what makes Raiders hostile to the player at all, unless it's in the game engine itself). She's friendly enough to me despite killing all the Raiders. Killing her doesn't affect the Outcast patrol outside the store. Her "getshouldattack player" is set to zero.
I can basically execute her without issues, but that seems contrary to the design.