My failure as a foster mom

I am so sorry that she did something to your cat. The first time my ffs tried to hurt the dog, I saw RED. I was SO mad. I agree with others who have said make sure that she isn't alone with the pets now.Also, know that you did not fail her. She have given her a great home for the past few months and she is better for it. Good luck with the next two weeks and the transition to her new house.