As long as she's happy, why would that be wrong? My foster Minette is happy for the first time in her life because we have her in her own room, away from the other cats. Of course, ideally I'd like her to be out and have free -roam, but she's happy as can be in the room herself. She has fresh water, toys, a warm bed, a window to look out, and humans to come in and give her love.... and NO CATS to bother her!