u/ShuLangstrumpf

I have 5 house cats (4 females, and a male) and I had two friendly barn cats (female), one of my barn cats was hit by a car about 3 month ago. Since then I've brought the other barn cat inside and I kept her in the basement to slowly introduce her to the others. It has worked well and they all get along. The basement door is always open so the cats can roam the house and basement as they please. The barn cat does not want to come upstairs, it's been 3 months and she hasn't made her way up yet. She seems fine in the basement and likes to hang out on or under the couch. It's a big comfortable basement but I feel bad for her being down there all the time. I've tried a lot of things to get her upstairs but then she just sits in front of the door trying to get back downstairs. I'm not planning on letting her outside again and she seems fine being a house cat, but her not joining all of us upstairs is making me wonder if she's truly happy. She enjoys being with the other cats and they join her downstairs but she never joins or follows them upstairs. Which then results in her being alone in the basement for good chunks of the day. Is there anything I can do or should I just let her be a basement cat? Does she just need more time to get used to being inside?