Mrs. Jones explained to her niece FIONA THAT SHE COULDN4T POISON THE NEIGHBOR'S BARKING DOG NO MATTER HOW MUCH SHE NEEDED HER BEAUTY SLEEP.
No change is necessary.
Fiona, "You can't poison the neighbor's barking...
Fiona "that she couldn't poison the neighbor's barking...
Fiona, "She couldn't poison the neighbor's barking ...