Hello everyone! I’m hoping to find some help with the recent introduction of my new cat and resident cats. I currently live with my roommate and we each have our own cat. Their introduction happened within a day and they are extremely close. I will be moving in a little under a month so I was nervous having my cat live alone after the move (she’s always been with another cat). Since I’m home until my new job starts in June I thought this would be the perfect time to get my cat a friend. The new cat is a little over a year (same age as the other two resident cats). She was a stray who was recently brought in extremely sick with her kittens (who didn’t make it ). After getting better she was spayed and during this whole time she stayed with her foster. The foster had 8 adults cats that she was able to get along with them no problems at all with no aggression. She was brought in in March and I just adopted her. Since I brought her home I’ve kept her in my room and she was hissing at the door at first. I’ve been feeding both cats by the door and they were doing okay and the hissing by the door stopped. We did some site swapping and that went well so we decided to do a baby gate visit. Initially there was some growling and hissing and we closed the door and tried again later. Eventually they would just sit by the gate looking at one another, no aggression. We decided to try a meet and greet finally since the new cat was very interested in leaving the room. Again initially a little aggression that we would break up and take a break from. Eventually they were starting to play and it seemed to be going well. Later that day my cat tried going into my room (the new cats safe space) the new cat let her in initially but when I walked in to watch, my resident cat ran out and the new cat charged at her. We separated them and tried again the next day and the same thing happened with my roommates cat. The new cat has become very aggressive recently and is now hissing and growling even through the baby gates and wants to get out to go after our resident cats. I’ve kept her in my room and I have not let her see the resident cats since. Today we did a room swap and she would not leave the area by the door. The was hissing at the door and seemed upset. I tried to distract her and play and ended up putting a towel under the door so she couldn’t see the shadows. She’s super friendly to me and loves cuddles and loves to play in my room but I’m having a very tough time introducing her. The resident cat’s are super sweet, not at all aggressive and just interested in meeting her. Since the charging they are a little more cautious going near the door and I think a little afraid. It has been 5 days total so not too long and I’m concerned I may have just rushed the process. I’m nervous this may have ruined the relationship between the cat’s and I’m not sure what to do. I’m just very upset and only wanted to try and find a friend for my cat before our move. Especially while I had the time to spend with them and introduce them. We have about two and a half weeks until the move and I’m concerned the move may make things worse. Any advice would be appreciated!! I sincerely want this to work out between them. I already love my new little one so much and I absolutely do not want to re-home her.