I have 4 zebra finches. I had to seperate the female a short while ago because the other birds were preening her to the point where she was near bald. I just put her back with the others, after all her feathers grew back in of coarse. Now the birds are fighting day and night. I've already added new toys and treats, but that did not seem to phase them one bit. Is there anything I can do to restore harmony in the cage?

Optional Information:
Age: 3; Female; Breed: zebra finch

Already Tried:
new toys, new treats