It might just take her longer to adjust.

I moved with one cat who was 11, I think he pretended he was scared and hid behind the bed for four days..on the fifth night, having to get up during the night I flipped the light on and could see downstairs in the living room, the little bum was rolling around on the carpet, playing with one of his toy's.

He was busted and he knew it.

The house then became HIS domain.

She has to come out to eat and use her box right?