American Shorthair kittens & cats in Vincennes, Indiana

This sweet girl approached my husband and I while we were sitting outside last fall. She hung around outside our door daily, no owner located. When winter came it got too cold we brought her inside to stay warm. Spring came we tried to put her back out. She would just sit on the step and seemed terrified. She’s been inside since. The issue is we already have 3 other cats, one is a very dominate female and she’s not friendly to Lily. We don’t want anyone to get hurt & we’re moving & won’t be able to provide her the care she deserves. She’s content as can be in a room alone but we’d like for her to have a better life. She is spayed, and has been treated for fleas. She is so sweet and friendly and lovable! Please help! Prefrr her to be an indoor cat only, because she seems terrified out there and has grown accustomed to indoors. She is grown but not senior, maybe 4-5. Very affectionate