apartment on the first floor so we'll have to keep her in. I'm going to build a cage for her on the balcony with some platforms so she can still be out and have a look around.

Have you ever done this? She was an indoor cat for the first 3 years of her life, outdoor for the last 2 years*.

*She's not one of those go away for 12 hours outdoor types, more like a couple of hours here and there. Never goes too far from the back door.