She was like that with Harvey when he was younger. Her mother was his main carer. I watched some documentaries on her years ago on BBC3 (I think!) and that's when Havey was a baby, she found out about his condition and she showed no emotion but when interacting with Harvey it looked like she was just doing it for the cameras and then her mother would take over.I’ve been on a rewatch binge and she seems very detached from all the kids. There’s one episode where Pete gets Jr from Cypress and Pete’s really annoyed with Katie because she hasn’t seen Jr for 2 weeks and she’s not at the airport to greet them, she doesn’t even stay up to give him a kiss and a cuddle when he gets home. Pete was really annoyed with her