2 years ago, my husband and I moved in with my mother. I brought two cats with me- Chip (male) and Willow (female). My mom has 3 cats- Bonnie and Bugsy (female) and Clyde (male). We transitioned them slowly and Chip gets along with everyone. Willow on the other hand, is afraid of everyone. She hisses and runs from Bugsy and Bonnie whenever they come near her. She slinks through the house like she is watching for attackers. And then there is Clyde. He and Willow are enemies. They hiss and spit and growl and slap at each other whenever they are in the same room. Clyde sprays all over the house constantly. My poor Willow never seems to relax and is so unhappy. We have Feliway plug ins, three water sources in 3 separate rooms, including a fountain, two tall cat trees, 6 litter boxes in seperate rooms, tons of different comfy places they can sleep, and they each have their own food bowl scattered around our largest room. Oh and all of the cats are spayed and neutered. What can we do to make Willow relax and help her and Clyde get along?