Factual error: In the scene at the fire truck, Abraham uses the deck gun to kill walkers. However fire truck water pumps are powered by PTO from the engine, which isn't running.
Continuity mistake: Maggie pulls the ladder from the rear of the firetruck, but in previous shots the only ladder on the firetruck is hung on the passenger side.
Answer: No, she actually tries to talk Rick out of it, but he's already made up his mind, minutes later when Daryl asks him about the location of his brother Lori says "he'll show you."