Making a cat happy indoor.?

Both Mercy's and Emily's answers are your best options. Kudos for being a responsible cat owner. Has she been spayed? If not, it might be part of the reason she wants outside. I'm certain that you don't want Prince Charming coming along and.... I'm certain you know what will happen on that date. Is it possible that those are Tom-Cats hanging out in your backyard waiting for a hot date with your little Princess?