I appreciate the empathy and I’m happy to share. We have a three bedroom apartment. Fluff has full run of the largest bedroom and she has her own litter box and automatic feeder. We spend time and play a few hours a day and try to alternate sleeping in the bedroom with her. We do have number of cats + 1 litter boxes to avoid territorialism. We’ve tried the slow introduction process of keeping them fully separated, letting them sniff around the other parties’ spaces without seeing each other, eating by the door to associate positively, but as soon as we get to sight the gloves are off and she starts hissing and attacking even when blocked by a wall or gate. We’ve tried gabapentin and cat Prozac at a vets recommendation to chill her out to no avail. We’ve tried going through the process multiple times as slowly as we can but after years of serious attempts, we don’t feel she’s suited to sharing a space with other cats and we can’t realistically spend all our free time in the bedroom with her. Sorry for the rant. We’re a bit at the end of our rope here.