Continuity mistake: When Bell and Germs carry Hagen to his car, after force feeding him the Renuyu formula, Hagen is wearing a full brown suit, but after Bell and Germs place Hagen inside the car, his jacket is now blue.
Continuity mistake: When Germs and Bell catch Hagen in the laboratory, they are both armed with pistols. But after the first commercial break, Germs' pistol turns into a rifle and Bell's pistol disappears entirely.
Answer: She escaped off-screen and created a copy of herself to fool everyone.