Help!! I have 2 girls. Willow is 5 and Kate is 2. Yesterday Willow had a bladder stone and had to be flushed, which resulted in am6 hour vet stay. She’s doing great- except for the fact that everytime her best friend sees her, she hisses and is very angry. I have them separated which is not an easy task. letting them just see each other from a distance. Any encouraging words out there? I feel so defeated..