Suggested Answer
The girl gave a tour of the house with the blue dress.She didn't give a tour "with the help of the blue dress" but in it, therefore the sentence should look like this: The girl with the blue dress gave a tour of the house.
The girl gave a tour of the house with the blue dress.She didn't give a tour "with the help of the blue dress" but in it, therefore the sentence should look like this: The girl with the blue dress gave a tour of the house.