My family and I have rescued 6 cats and recently rescued a little kitten, we had her in her own room for a while and tried to slowly introduce her to the other cats, we tried scent swapping and seeing each other through the crack door and we wanted to introduce them to each other only to have one of the cats attack her. Since then she has stayed in her own room and the cat that attacked her has been waiting outside the room scratching at the door, she would hide and try and run into the room if we went near it. She once ran from her hiding place and then between my legs to get into the room, she immediately attacked the kitten and gave her a cut on her stomach. The other cats seem to not mind her and don’t act anything like this cat, one of them went into her room and he just sat with her no problem. Even our oldest cat that tends to attack new cats, has left her alone. They do not hiss at her like this one cat does. We really want to let her out of this room and let her be a normal cat in the house, I hate having to keep her there but it’s the only place she feels safe and relaxed because of this other cat. Any suggestions on how we can get them to be friends would be much appreciated, we really need the help.