Aqua Pura crates appear in front of Evergreen Mills, even though the purifier hasn't been activated yet.If a player starts a new game with Broken Steel already installed, when listening to GNR, Three Dog will sometimes make reports on the purifier being retaken from the Enclave by the Brotherhood of Steel and clean water is flowing into the Potomac River, despite the fact that the player has not reached that point in the game.See the Talk page for a step-by-step walkthrough of how to fix this bug by using the GECK. For the PC version, you can permanently fix this problem with the GECK.
That will make her follow you again, but this problem will resurface any time you tell her to wait in the future. The only way to get around this bug in the console versions is to fire and re-hire her. After telling her to follow you she stays put, yet her dialogue options change as if she was following you. See: Broken Steel exploits Multi-platform